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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 10-18-2013, 11:52 AM
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Question High-flow cats

It seems there are 100's of threads on doing cat-back exhaust systems and everyone's got an opinion on it.

So here's my question, it seems like the biggest restrictions to your stock exhaust system is the muffler and the catalytic converter. Wouldn't one be better served swapping to a high-flow catalytic converter with a performance muffler rather than a cat-back exhaust.

If you look at the specs on the cat-back system from Magnaflow, the pipe sizes aren't any different, and at the end of the day, thats the only difference I see in doing the cat-back.

What are your thoughts on the subject and any tips would be great. I would like to do a Trinity tuner later on but it seems to really reap the rewards, you need to get more airflow through your engine.

Thanks guys!
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Old 10-18-2013, 01:37 PM
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That's exactly what a lot of guys around here have done. The stock system flows quite well so many people just swap out that ENORMOUS stock muffler and maybe do LT headers or replace the crimped y-pipe with a magnaflow one. I am in the process of doing the same, getting my Borla welded in next week!
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Old 10-18-2013, 05:42 PM
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Borla sounds awesome. I wanted to see what some others thought about swapping the cats out with something that allows higher flow.
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Old 10-18-2013, 06:04 PM
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I would think the stock manifolds are more restrictive than the cats. To me unless you change the cam and go bigger TB for more WOT air intake the cats are plenty big. Shorty headers that bolt in with your stock y-pipe/cats would be all you need for stock engine with just a performance tuner. But try www.shophemi.com. This is Buddy Arrington's shop. They Hotrod the modern Hemis, if anybody knows they will.
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Old 10-18-2013, 07:49 PM
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Quote:
Originally Posted by oldhp View Post
I would think the stock manifolds are more restrictive than the cats. To me unless you change the cam and go bigger TB for more WOT air intake the cats are plenty big. Shorty headers that bolt in with your stock y-pipe/cats would be all you need for stock engine with just a performance tuner. But try www.shophemi.com. This is Buddy Arrington's shop. They Hotrod the modern Hemis, if anybody knows they will.
Oldhp, my feelings exactly! I can't imagine how these engines make the power they do with these stock manifolds. It's a little surprising considering the way Chrysler made some of the more streamlined exhaust manifolds back in the day.
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