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Posted by: tracks914 Aug 27 2004, 02:09 PM

I have, in the past, experimented with exhaust systems for various vehicles and bikes. Most of the time it was to take someone elses ideas and make them work on my project. Has anyone tried this with a type IV?
I have 2 original type exhausts and even thought of modifying one of them for a deeper sound or better air flow. What have you done that I can learn from? (besides go out and buy a bursch)

Posted by: Brad Roberts Aug 27 2004, 07:20 PM

We are pretty lame when it comes to custom exhaust work. I spent two years farting around with mufflers and the such (the company who made all the stainless heat exchangers for the 914's) and we had a muffler that had access panels built into it. We had baffle plates (4 of them) in the muffler. Each plate had 100 or so threaded holes. We would add or remove little allen bolts to those holes to produce the back pressure and sound that we wanted. It was a painstaking task... but it worked. Once we found the proper combo we would stamp out new baffle plates with the number of holes we had left over after installing X number of screws.


B

Posted by: Aaron Cox Aug 27 2004, 07:22 PM

im doing a setup like this for a 4


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Posted by: 736conver Aug 27 2004, 07:45 PM

Is anybody interested in this type muffler. It is SS and is two in two out. Weighs about 14lbs. Designed for a 6 but it should sound pretty decent for a 4. No sound bites for a 4 but if your interested send me an email and I can send a sound bite on a six. It is for sale and orders are being taken. Has a nice throaty sound too it. Already have many happy customers.
$300


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Posted by: 736conver Aug 27 2004, 07:46 PM

comparsion to bannana


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Posted by: Andyrew Aug 27 2004, 11:47 PM

Send me the sound bite... im just curious how it sounds. I have some "idea's" for my v8 sound.. adalen@pacbell.net

Oh you guys might like this... Im planning on buying the new corvette mufflers... I love the sound of a corvette, and it should be just loud enough with the headers straight to the stock mufflers (oh ya... quad tip....)

Posted by: 736conver Aug 28 2004, 04:14 AM

I sent you the clip. Tell me how it sounds. I think it sounds sweet.

Posted by: James Adams Aug 28 2004, 08:05 AM

Posted by: tracks914 Aug 28 2004, 08:06 AM

Posted by: tracks914 Aug 28 2004, 08:09 AM

Posted by: Aaron Cox Aug 28 2004, 08:13 AM

its a dual in dual out flowmaster/dynomax/magnaflow crossflow muffler.

Posted by: BIGKAT_83 Aug 28 2004, 08:19 AM

These people sell tubing bends and collectors and mufflers.
I've seen some of the collectors and they are works of art.

Bob.

www.burnsstainless.com

Posted by: 736conver Aug 28 2004, 08:29 AM

Doug,

I sent you the sound bite. Tell me what you think.

Brian

Posted by: tracks914 Aug 28 2004, 08:36 AM

OOOO AAAAh I really really like it. Smooth and no popping tinney sound.
How, oh how, would it sound an a 1.7.
You sould put a link to it on this post so others can enjoy it as much a I did. I played over again to to smile.

Posted by: TimT Aug 28 2004, 08:41 AM

I didnt make the actual mufflers ( got them from Coast Fabrication)

I just made up the cross over pipe

This system is kinda loud, I doubt Ill pass sound at Lime Rock


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Posted by: nsyr Aug 28 2004, 09:37 AM

Anybody have a Boxster type muffler on their car? I really like the exhaust tip in the middle.

Posted by: 736conver Aug 28 2004, 10:35 AM

Here's the link to the muffler. If anyone is interested in it orders are being taken.

http://home.centurytel.net/picsofsort/HPIM0109.AVI

Posted by: seanery Aug 28 2004, 11:14 AM

that sounds sweet!

what engine was that? SC?

Posted by: charlesmac Aug 28 2004, 11:37 AM

A couple of years back, a friend of mine took a D&D exhaust canister from a honda CBR600f2, got some tubing bent to come out of the header and tuck it under the fender of his 67 bug. It wasn't real loud while cruising, but man did it wake up when you stepped on it. Awesome deep throaty sound!! The engine was a 1776 by the way.

charles

Posted by: 736conver Aug 28 2004, 12:22 PM

Yes that was a 3.0. Sounds just as good on a 2.7.

Posted by: James Adams Aug 28 2004, 12:24 PM

Posted by: thesey914 Aug 28 2004, 01:23 PM

That sounded really mellow + smooth.

Posted by: seanery Aug 28 2004, 08:27 PM

Brian,
Are these a group buy?
or are they "Now Taking Orders"?

I'll want one, but don't need it for quite a while.

Posted by: Andyrew Aug 28 2004, 11:51 PM

Brian
I liked the sound, it just wasnt loud enough for me. Nice tone though!
I think it could have been more throaty with less chambers and a resinator/glasspack somewhere..

Just my thoughts.

Andrew

Posted by: 736conver Aug 29 2004, 03:10 AM

This is not a group buy. We have started making these already. Right now were back ordered by about 5 people. With other people waiting in the wings. We should be caught up in a week or two. It is a first come first serve basis. Mufflers are sent out as people pay, in the order they paid.

Posted by: tracks914 Aug 29 2004, 08:26 PM

Just saw this on Ebay.http://Muffler


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Posted by: RON S. Aug 30 2004, 04:40 AM

Aaron,
Not wanting to rain on anyones parade,but I can't help but notice that your muffler looks identical to the one sold by some guys outa New Jersey.Their website is InstantG's and they specialize in early 911 conversions to 3.6 power.
Same muffler,with the same B&B flanges,except,they want about $700.00 for their muff.You say $300.00 for yours,thats a big difference.
I looked at it for my install in my 3.6 6r.
How about some under car pics to see the chassis fit?
Are yours only gonna be setup for B & B headers,or do you have standard flanges,How about tips that come out like the Dansk unit?
Just some quextions.
Ron

Posted by: 736conver Aug 30 2004, 08:02 AM

Ron,

Aaron is not selling his muffler.
I'm the one selling mufflers.

Brian

Posted by: maf914 Aug 30 2004, 08:34 AM

Brian,

Your muffler reminds me of the stainless steel muffler sold by Mittlemotor in Germany. It has a single outlet instead of duals. I have one and the sound is similar to the sound in your video. Any connection between the two?

Good luck with this effort. A SS muffler should be popular.

Posted by: RON S. Aug 30 2004, 09:02 AM

Sorry Brian,
No offense,I got it bass-ackwards reading all the posts.
It's a great endeaver,cost seems very reasonable.
Jus'wanna see sum fitment pics.
Ron
Maybe this link to instantG will work

http://instant-g.com/Products/Exhausts/Dual-In-Out/

Posted by: Demick Aug 30 2004, 10:03 AM

Brian

Ron asked some very good questions - but you did not answer them.

You keep talking about using this muffler on a 4 cyl car, but do not give any indication on how to actually put it on. The muffler in the pictures has flanges for a six. Is the muffler offered with flanges that fit a 4 cyl car (and if so, there are 3 different styles: '70-'74 1.7 and 1.8, '73-'74 2.0, and '75-'76 cars). Or are the mufflers that you are selling exactly like the pictures - which means putting headers on a 4 cyl car to make it fit - and in that case, you should specify what style of headers it is made to fit.

Also, the picture showing the muffler on the car is clearly different from the picture showing the muffler on the floor (exhaust tips very different). What exactly are you selling?

These are just questions that any 4 cyl car owner interested in this needs to know.

Demick

Posted by: 736conver Aug 30 2004, 10:27 AM

Demick,

If you look at my first post you'll see I said these were designed for a six. I said they should sound decent on a 4.
I think Ron is looking for a six muffler also. Not sure I just saw the number under his avatar and in his signature.
Again this were designed for a six. 4cyl would have to make some header changes.
I will try to get some pictures for fitament under the car.

Sorry for any confusion

Posted by: Demick Aug 30 2004, 11:04 AM

Brian

Thanks for the clarification. I suspected that was the case. But I saw a bunch of -4 owners getting excited about this muffler for their cars and wanted them to know exactly what the situation is.

By the way, if you could have the flanges changed to fit 4-cyl cars (esp '73-'74 2.0) I think you could sell a lot of these at $300 each.

Demick

Posted by: 736conver Aug 30 2004, 11:07 AM

That is something were looking into right now. We will also need a "test subject" who can record sound for us.

Posted by: Aaron Cox Aug 30 2004, 11:10 AM

Posted by: seanery Aug 30 2004, 11:25 AM

Brian,
If you make it down for the FFC, we can put a 4 cylinder version on whitey. It's got a Triad on it now. It would be a good comparison.

I do want one for bluecar, though.

Posted by: 736conver Aug 30 2004, 12:13 PM

I going to try the best I can to go to the FCC. I figure I would register to convince the wife even more. Well see.

Posted by: RON S. Aug 30 2004, 12:26 PM

Brian,
I indeed will be shopping for a muff for my 6r sometime this year.
I'm curious about the fitment,cause I've already experimented with a couple mufflers.
The banana type is ok,fits as it should.No performance sound there,and single outlet.
I have a used B & B unit.The oval unit would be a lotta work to make it look like a nice fit.It came off a 911.It's tight against the valance.
Yours looks like it maybe a nice fit.What brand is the muff,or do you make the complete unit yourself?I like the type of tip in the pic,straight out the back.Ala"the Dansk unit"
My main reason for a pic of the muff installed,chassis shot is that my car has a 915 box and I like to get a feel for what I'd be in for if I would take the gamble.

How about a pic.

Ron

Posted by: 736conver Aug 30 2004, 12:39 PM

Ron,

These were handcrafted by another 911/914-6 owner. Unfornutely the only 914 that this was in was sold recently. I will try and get a picture from the new owner though. I will also talk to the maker of these and find out more fitament details.

Brian

Posted by: RON S. Aug 30 2004, 12:48 PM

Thanks Brian,
It is a really nice lookin piece,
I've looked at several units out there,and @ $300.00,it's a baragin to me.Even if the unit came to me only tacked together,and I'd finish tig'n it up.

Good part.
Ron

Posted by: PAPERBOY Aug 30 2004, 01:05 PM

Brian,

I'd be a test case for a 4. I've got a '74 2.0, stock h/e's Bursch exhaust. I live in Waukesha county(New Berlin). I agree, you could sell a bunch of these for 4's. Let me know if you still need someone to try it out on, no problem recording the sound.


Jay

Posted by: Mueller Aug 30 2004, 01:11 PM

at least for the /4's*, recording the sound is okay, but to me it's useless unless you can do a sound comparison back to back...........also, do you have access to measure the dB levels? (which again would need to have a comparison to help)


*/6 motors always sound awesome, it does not matter what muffler is installed

Posted by: 736conver Aug 30 2004, 01:25 PM

Jay,

I sent you a PM. I am just down the road from you.

Brian

Posted by: 736conver Aug 30 2004, 01:33 PM

I sent Sean a PM. I might be able to send one of these down to the FCC even if I cant make it.

Posted by: 9146986 Aug 30 2004, 02:35 PM

Any thoughts about a dyno test?

I realize 914'ers tend to be the, um, er, thrifty end of the Porsche spectrum. So $300 is in the right price range.

My personal preference would be performance first and sound second. I'm one of those oddballs that does not like Bursch (headers or "mufflers"), and prefers the sound and performance factory style mufflers. Not to big of a fan of loud exhausts.

PK

Posted by: 736conver Aug 30 2004, 05:12 PM

Just an update for the 4 poppers out there. It will take some time to develop.
Its going to be hard to keep them in this price range with the flanges. I will update everyone when a 4 gets developed.

Posted by: Marty Yeoman Aug 31 2004, 10:41 AM

I like the packaging of using a Flowmaster cross-flow for a 914-4 application. However, the question I have is: How is the crossflow accomplished within the Flowmaster muffler (42582 I presume). The firing order of a 4 cyl is 1-4-3-2. This means that first one head fires both cylinders then the other (alternating back and forth). Without communication between the two wouldn't the exhaust also alternate between sides? Has anyone looked into this?

Posted by: Demick Aug 31 2004, 11:02 AM

When I did my muffler, I looked into using one of these 2 in 2 out flowmasters much like the picture Aaron shows on page 1 of this thread. Problem was that the muffler was too long to fit between the exhaust flanges (considering tubing bend radii and room to combine from the dual pipe exhaust flanges of the heat exchangers, etc). I would have had to go from the exhaust flanges 90 degrees outward, and then 180 degrees back inward to the muffler inlets. That was too much work. Much easier to just weld on a regular 40 series onto the 4-1 collector. But of course with this, you don't get the dual muffler outlets.

Demick


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Posted by: Aaron Cox Aug 31 2004, 11:21 AM

ahhh grasshoppa,

this dynomax muffler is small enuff to fit between both flanges of the heat exchangers
this would also require a little u bend too. the bursch exhaust already has 90 to 180 degree bends in your picture. my drawing isnt done yet...just to give you an idea. also. my current bursch already has 2.25 inch tubing, seems very doable to me


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Posted by: Aaron Cox Aug 31 2004, 11:42 AM

the flowmaster's case is 2" bigger and overall 3.5" longer...............too big


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Posted by: Demick Aug 31 2004, 12:10 PM

Yep

Just what I was talking about. Too much work for me. Yes, some of the bends and flanges from a hacked up Bursch or equivalent could be used. One problem - the 90 degree bends out of the HE flanges only go toward the right. You will need one set that bends to the right and one set that bends to the left. It will also then be a PITA to combine each pair of tubes before entering the muffler.

Like I said, too much work for me.

Demick

Posted by: Aaron Cox Aug 31 2004, 12:16 PM

Posted by: Demick Aug 31 2004, 12:23 PM

Ahhhh. Well that will save you a lot of work then.

Demick

Posted by: tracks914 Aug 31 2004, 07:09 PM

My initial thought was to make a SS exhaust similar to the factory original but with a bigger expansion chamber and a bigger (single or dual) outlet to give it a throatier sound. Anybody try this or just adapt another exhaust system to a teener? <_<

Posted by: Aaron Cox Aug 31 2004, 07:35 PM

My initial thought was to make a SS exhaust similar to the factory original but with a bigger expansion chamber and a bigger (single or dual) outlet to give it a throatier sound. Anybody try this or just adapt another exhaust system to a teener?

Posted by: tracks914 Aug 31 2004, 08:09 PM

you dont like my idea>? jk

Posted by: Aaron Cox Aug 31 2004, 08:45 PM

QUOTE(acox914 @ Aug 31 2004, 05:35 PM)

you dont like my idea>?  :o  :(      jk  :lol:

I love your idea...I just like mine better.



All those bends without a good bending machine sounds like a lot of work. I just thought my way would be a bit easier and still get the deeper sound I am looking for, but until I try it I will never know.