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914World.com _ 914World Garage _ SBC 350 exhaust question
Posted by: pete Sep 8 2010, 10:47 AM
I have a Renegade SBC 350 with shorty headers I will soon be installing in my 914. Looking at several threads/pics of this conversion it looks like almost all pipes from the header to the muffler loop under the axles. Is there a stock part number for these curved pipe sections (steel) or are they all basically custom?
Posted by: messix Sep 8 2010, 10:50 AM
if you can fab it by your self you could order some sections and cut and weld it up your self.... but i'm thinking it's prolly best if you have an exhuast shop do it for you.
Posted by: messix Sep 8 2010, 10:56 AM
oh and you'll find most of the stuff for the v8 at summit or jegs. nothing will be a stock part number.... your building a "hotrod" all most every thing will be hot rod parts or fabricated by you or renegade or kenedy.
Posted by: Phoenix-MN Sep 8 2010, 11:38 AM
I have "shorty" headers and ran the exhaust over the axles. I mocked-up/welded what I needed and sent the parts to HeartThrob Exhaust and had them mandrel form the pipes.
Posted by: charliew Sep 8 2010, 12:04 PM
I would just buy mandrel bent elbows and some straight tubing and make it out of stainless steel and be done with it.
Posted by: kg6dxn Sep 8 2010, 12:10 PM
I have a Renegade SBC 350 with shorty headers I will soon be installing in my 914. Looking at several threads/pics of this conversion it looks like almost all pipes from the header to the muffler loop under the axles. Is there a stock part number for these curved pipe sections (steel) or are they all basically custom?
I have a Renegade exhaust. Renegade sells the curved pipes that go over the axles. Otherwise it is a custom job. There is nothing wrong with pipes going under axles. You just need clearance from the axles and the ground.
Posted by: Andyrew Sep 8 2010, 12:27 PM
I have the shorty headers, You have to watch out for the shift rod.
If you can, Go for some short tube truck headers (not the shorty's, they actually curve up I believe which is perfect for the 914).
Then go to a couple muffler shops and ask them how much. Get some magnaflows, go for 2.5" and you'll be happy! I had mine done years ago for 300 including the mufflers. You should be able to get it done for pretty close to that in this economy.
Posted by: pete Sep 8 2010, 01:01 PM
I would just buy mandrel bent elbows and some straight tubing and make it out of stainless steel and be done with it.
Thanks for the advise. I was probably going to go the custom route. I own a fastener packaging company and my customers always make us "prebag" stainless fasteners to keep them separate from the Low carbon steel fasteners. They tell me there is a galvanic reaction between the two metals. Would this me a problem using stainless tubes/flanges mated to my steel header flanges?
Posted by: pete Sep 8 2010, 01:04 PM
I have the shorty headers, You have to watch out for the shift rod.
If you can, Go for some short tube truck headers (not the shorty's, they actually curve up I believe which is perfect for the 914).
Then go to a couple muffler shops and ask them how much. Get some magnaflows, go for 2.5" and you'll be happy! I had mine done years ago for 300 including the mufflers. You should be able to get it done for pretty close to that in this economy.
The headers I have do curve upwards slightly. I just looked at Renegades website. My headers look like their headers. I bought the engine on ebay. So I'm not sure where everything came from.
Posted by: messix Sep 8 2010, 01:08 PM
I would just buy mandrel bent elbows and some straight tubing and make it out of stainless steel and be done with it.
Thanks for the advise. I was probably going to go the custom route. I own a fastener packaging company and my customers always make us "prebag" stainless fasteners to keep them separate from the Low carbon steel fasteners. They tell me there is a galvanic reaction between the two metals. Would this me a problem using stainless tubes/flanges mated to my steel header flanges?
won't be a big deal 'cause there will be a gasket between them. spend the extra money on ceramic coated headers.
Posted by: andys Sep 8 2010, 01:30 PM
Though not an SBC, I used stainless mandrel bends and routed the exhaust over the axles. Not sure which muffler shops can weld stainless (perhaps these days they all can), but it's a pretty simple task for a decent shop.
There are quite a lot of V8 exhaust system pictures on this site if you search around. I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
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Posted by: pete Sep 8 2010, 02:25 PM
Though not an SBC, I used stainless mandrel bends and routed the exhaust over the axles. Not sure which muffler shops can weld stainless (perhaps these days they all can), but it's a pretty simple task for a decent shop.
There are quite a lot of V8 exhaust system pictures on this site if you search around. I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Andy, thanks for the pic. It looks like you have two of the same pieces welded together on each side.
Posted by: kg6dxn Sep 8 2010, 02:32 PM
Though not an SBC, I used stainless mandrel bends and routed the exhaust over the axles. Not sure which muffler shops can weld stainless (perhaps these days they all can), but it's a pretty simple task for a decent shop.
There are quite a lot of V8 exhaust system pictures on this site if you search around. I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Andy, thanks for the pic. It looks like you have two of the same pieces welded together on each side.
That is exactly what the Renegade exhaust tube looks like. Without the weld in the middle.
Posted by: type47fan Sep 8 2010, 11:52 PM
I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Like this from skline's V8 Chalon project a few years back. . . .
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Posted by: pete Sep 9 2010, 07:07 AM
I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Like this from skline's V8 Chalon project a few years back. . . .
Ha! That's pretty wild looking.
Posted by: computers4kids Sep 9 2010, 07:52 AM
One major dis-advandtage of not going over the axles is it really limits the travel of the half shafts when you need to remove/work on something. If I ran mine under the axle like the above, I would at least make it where you could pull just one side. Very clean looking , just not as practical.
Posted by: andys Sep 9 2010, 09:33 AM
I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Like this from skline's V8 Chalon project a few years back. . . .
Ha! That's pretty wild looking.
Yeah, that's the one I was thinking of; puts the muffler where it ought to be. BTW, I too am a proponent of running the pipes over the axles.
Andys
Posted by: BRAVE_HELIOS Mar 1 2011, 07:11 PM
I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Like this from skline's V8 Chalon project a few years back. . . .
Is there any way of getting the specs for this muffler? My local muffler guy wants to install a Magnaflow muffler (dual in / dual out). I went to Magnaflow's website and they have a large selection of dual in dual out mufflers... at different price points. If I can get the dimensions of the muffler pictured (make and model too), that would help alot!
Posted by: matthepcat Mar 3 2011, 09:30 PM
The nice thing about the dual in dual out magnaflow, is you are essentially putting an "X" pipe in your exhaust system that balances the exhaust pressure and helps to lower drone.
I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Like this from skline's V8 Chalon project a few years back. . . .
Is there any way of getting the specs for this muffler? My local muffler guy wants to install a Magnaflow muffler (dual in / dual out). I went to Magnaflow's website and they have a large selection of dual in dual out mufflers... at different price points. If I can get the dimensions of the muffler pictured (make and model too), that would help alot!
Posted by: BRAVE_HELIOS Mar 4 2011, 04:05 PM
That's the main reason why I want to go that route, plus I've read that it sounds pretty good too! 
The nice thing about the dual in dual out magnaflow, is you are essentially putting an "X" pipe in your exhaust system that balances the exhaust pressure and helps to lower drone.
I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
Like this from skline's V8 Chalon project a few years back. . . .
Is there any way of getting the specs for this muffler? My local muffler guy wants to install a Magnaflow muffler (dual in / dual out). I went to Magnaflow's website and they have a large selection of dual in dual out mufflers... at different price points. If I can get the dimensions of the muffler pictured (make and model too), that would help alot!
Posted by: sww914 Mar 4 2011, 04:27 PM
Though not an SBC, I used stainless mandrel bends and routed the exhaust over the axles. Not sure which muffler shops can weld stainless (perhaps these days they all can), but it's a pretty simple task for a decent shop.
There are quite a lot of V8 exhaust system pictures on this site if you search around. I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
That'll never fit!
Posted by: BRAVE_HELIOS Mar 4 2011, 04:33 PM
Hmmm, what won't fit? 
Though not an SBC, I used stainless mandrel bends and routed the exhaust over the axles. Not sure which muffler shops can weld stainless (perhaps these days they all can), but it's a pretty simple task for a decent shop.
There are quite a lot of V8 exhaust system pictures on this site if you search around. I seem to recall a dual inlet/dual outlet Camaro muffler that fits in the original location that looked real nice.
Andys
That'll never fit!
Posted by: joefri187 Mar 4 2011, 05:44 PM
I have a Renegade SBC 350 with shorty headers I will soon be installing in my 914. Looking at several threads/pics of this conversion it looks like almost all pipes from the header to the muffler loop under the axles. Is there a stock part number for these curved pipe sections (steel) or are they all basically custom?
I bought these inexpensive "Raptor" mufflers on Ebay for about $50 and the resonator tips for $10. The mandrel bends and tubing were also Ebay for less than $100. Just took some cutting, welding and grinding.
The exhaust ended up being a fun part of the project.
Posted by: jimkelly Mar 4 2011, 06:32 PM
or you can ignore form completely : )
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Posted by: BRAVE_HELIOS Mar 4 2011, 07:36 PM
Not at all... it's free form!
or you can ignore form completely : )
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