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> New -6 and 911 muffler plus possible type 4 muffler.. With an inside look.
Justinp71
post Jul 11 2017, 10:57 PM
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Interesting... How do you think they'd compare to the original M&K dual in/single out?

They will be higher flowing, correct? Sound similar?
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gulf908
post Jul 12 2017, 01:35 AM
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Ben

still interested in a 2 in 1 out for my standard motor May '70 914-6
I would like to have the original Leistritz 901 sound as much as possible
let me know pls

TIA
Dennis (IMG:style_emoticons/default/smile.gif)
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mb911
post Jul 12 2017, 10:18 AM
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QUOTE(Justinp71 @ Jul 11 2017, 08:57 PM) *

Interesting... How do you think they'd compare to the original M&K dual in/single out?

They will be higher flowing, correct? Sound similar?



No not at all like an m&k they will sound similar to stock .. The goal is to produce something similar to stock in both sound and flow.
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mb911
post Jul 12 2017, 10:19 AM
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QUOTE(Krieger @ Jul 11 2017, 07:16 PM) *

What do you think the weight would be compared to stock? And the reaching question, do you have any idea where the sound would be for us track guys with db requirements? With a stock muffler I have had no issues at Laguna Seca. I can't remember if it's 90 or 92 decibels.



Should be just as loud as stock.
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bretth
post Jul 12 2017, 11:06 AM
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Is it accurate that the early 911 and 914-6 mufflers have the same dimensions except for the bend in the tailpipe?

Brett
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mb911
post Jul 12 2017, 11:07 AM
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QUOTE(bretth @ Jul 12 2017, 09:06 AM) *

Is it accurate that the early 911 and 914-6 mufflers have the same dimensions except for the bend in the tailpipe?

Brett



Yes.
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mb911
post Jul 14 2017, 08:54 AM
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Small update between the huge flodding amd lose of power for days around here.Attached Image Attached ImageAttached Image
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mb911
post Jul 14 2017, 10:32 AM
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Small update between the huge flodding amd lose of power for days around here.Attached Image Attached ImageAttached Image
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mb911
post Jul 21 2017, 07:11 PM
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Attached Image Attached Image

Final prototype.. Ready for initial try.
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Steve
post Jul 21 2017, 08:09 PM
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Have you figured out a group buy yet?
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rktmn247
post Jul 21 2017, 08:18 PM
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Looks nice. How much does it weigh? Would like to hear it with your headers. (IMG:style_emoticons/default/smilie_pokal.gif)
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mb911
post Jul 21 2017, 08:18 PM
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Not yet but I will definitely do one to launch it.. Probably limit to the same amount of heat exchangers I sold and trying to make it work for everyone. I need to also get a realistic timeline for laser cutting so the group buy doesn't go for months on end.. I will send this muffler out for testing and then start the group buy..
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mb911
post Jul 21 2017, 08:24 PM
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QUOTE(rktmn247 @ Jul 21 2017, 06:18 PM) *

Looks nice. How much does it weigh? Would like to hear it with your headers. (IMG:style_emoticons/default/smilie_pokal.gif)



I will have to weigh it when i get back. Up north right now fishing.
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mb911
post Jul 25 2017, 11:12 AM
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Ok so shipped today for the 1st test.. In the box with packaging material came in at shipped weight of 25lbs.. But for comparison the m&k sport muffler in a similar but smaller box and a smaller muffler all together ship weight is about 20lbs. I would put packaging at 3-4 lbs so gives you an idea. Once testing is completed I will start a group buy and with a real timeline delivered ..
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mb911
post Jul 27 2017, 04:47 PM
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Muffler currently being tested.. And possible going to a member here next for a track day but once that is confirmed and all of the fittment is done then start selling group buy priced.
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mb911
post Jul 30 2017, 06:48 PM
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Muffler is on the way to Gary as of right now he intends to use it this weekend to get feedback etc on the track.. The other test went well sounds just a touch louder then stock, no drone, just a touch to long sp hit a few little brackets on the 911 it was fit on. So far looking good.
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mb911
post Aug 5 2017, 06:17 AM
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So testing is going well and we new we needed to change tail pipe locations so that was just a confirmation.. Sound levels are hitting targets and the good news if someone wants it louder the old factory mods to a sport muffler work the same on this muffler..here is the feedback as quoted

"
Ok Ben, Just got home from muffler install. First impressions:

The fit finish quality is great.

As I am sure you know the tail pipe does not match up to the stock outlet location. Height wise and angle, it appears fine, but exits considerable more outboard from stock. It seems to me that the muffler body will have to be shorter or the tail pipe bend radius will have to be very tight.

I know you were trying to match the stock sound level. In my un-instrumented opinion, you pretty much did that. I can detect no significant difference in sound level or sound quality from stock. I suppose this will appeal to many, but for me, I want something more sporty when shelling out the bucks for an "aftermarket" muffler. Sorry, but if I wanted stock sound why wouldn't I just buy a stock muff?

Weighs in at 18 pounds even. The stock Liefrentz (sp?) comes in at 21.5.

No discernible difference in seat of the pants dyno readings.

So looks like I am all set for the track day on Saturday. Plan is to run it up the flag pole and see who salutes. Wish it had a little snarl to announce it's arrival. Keep in touch. "
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mepstein
post Aug 5 2017, 07:20 AM
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I think for everyone who wants some snarl to the muffler there will be 10 who want stock quiet so they don't piss off the neighbors or drive the wife out of the passenger seat.
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mb911
post Aug 5 2017, 07:47 AM
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QUOTE(mepstein @ Aug 5 2017, 05:20 AM) *

I think for everyone who wants some snarl to the muffler there will be 10 who want stock quiet so they don't piss off the neighbors or drive the wife out of the passenger seat.



I would agree and the best part is the muffler is able to be modded to taste.
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Cairo94507
post Aug 5 2017, 09:49 AM
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Glad this project is progressing nicely. I have to admit I would like a bit more "snarl" than stock, but not much. But for me, the deciding fact will be this SS muffler will mate perfectly to Ben's large tube SS heat exchangers, since those are definitely going on my car. I want it all to match nicely.
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