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leejoy 07-12-2008 07:06 AM

Exhaust Pipe Sizing - Help
I have a 1972 chevy nova street muscle car. It needs a new exhaust system. It has a 550 HP Big Block Chevy. The headers have 3-1/2" collectors.

Should I go with an X-pipe type system or just standard dual exhaust or doesnt it matter?

What size exhaust pipes should I use? 2-1/2", 3", 3-1/2"?

I would like some free flowing mufflers that are loud. Can you recommend any particular make or model?



GunnerTHB 07-12-2008 06:15 PM

well for true duals 2 1/2 should be enough...but if you are going to run a y-piped setup you may need somethin around 3 1/4 inch to 3 and a half....pretty uncommon size tho. Magnaflow makes some great flowing mufflers

schatzy 07-12-2008 06:19 PM

I would use a x pipe with 3" and Hooker Aero Chamber mufflers. Nice looking nova by the way!

stroker_SS 07-12-2008 06:30 PM


Originally Posted by schatzy
I would use a x pipe with 3" and Hooker Aero Chamber mufflers.

+1, not only would it flow great, it would sound so sexy.

stroker_SS 07-12-2008 06:33 PM


I would like some free flowing mufflers that are loud.

The dynomax bullet would meet both of those standards.

ScoTFrenzel 07-12-2008 08:43 PM

A big power boost would be 24-28 inch collectors then 3" H pipe.
If you have room an expansion chamber would be a good move,
then the mufflers of choice for sound. I am a big fan of the Dynomax line and Magnaflow line.
Look into David Vizard's exhaust system design that includes expansion chambers.

onefastchevy 07-12-2008 10:20 PM

X-pipe will help flow and can free up a few ponies. I run warlock mufflers on my 396, they sound incredible, and have knockoffs built in so you can go to straight pipe sound, and performance, in about 1 min!! Easy to set up an electric dump as well (my next project!)

65 Imp SS 07-13-2008 12:56 AM

Here is a site for h.p/c.i. to pipe size
I run with hookers to 3", flowmaster s pipe, to pypes x, to 3" magnaflow mufflers.

454C10 07-13-2008 07:13 AM

I would run 3" pipe (even though 2.5 would be enough). If you decide on 2.5" (for more ground clearance) then use mandrel bends. A 2.5" system built with mandrel bends will flow like a 3 inch system using crushed pipe.

Make a H or X pipe right after the transmission the use a pair of hooker aero-chambers. If it is too loud, install a pair of 12"x 4" dynomax bullets in line (before the mufflers would be best but after also works).

If you decide you want to quiet and good flow, then install a set of dynomax super turbos.

leejoy 07-13-2008 11:15 AM

wow, my head is spinning now.

thanks for all the tips guys. A lot more information than I expected. Great Job.

It sounds like most of you guys are suggesting an H or X pipe setup. That's fine. I'll educate myself more about it.


65 Imp SS 07-14-2008 08:22 AM

Well if you need some more reading material this might help, take a look here http://www.pontiacstreetperformance....p/exhaust.html

Chevrolet4x4s 07-14-2008 09:04 AM

I have x pipe and thrush glasspacks on my truck, sounds great but not obnoxiously loud ,glasspacks arent broke in yet. Th x pipe gives it a verry good sound.


jimfulco 07-14-2008 07:26 PM is a listing of Dynomax Super Turbo mufflers with horsepower capability data listed for single/dual systems.

Relative loudness is also listed with sport being louder than street.

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