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- - Exhaust Question (https://www.rx7club.com/3rd-generation-specific-1993-2002-16/exhaust-question-263037/)

M. F. Luder

01-21-04 02:03 PM

Exhaust Question

Hi all, Just a quick exhaust question for you. Can I use a 3" Hi-Flo Cat with the stock cat-back exhaust? Also, what are the pros & cons. Thanks in advance.

wonder1and

01-21-04 02:29 PM

I had a 3" dynomax cat welded onto a street pipe. That worked just fine.Plus you can eliminate your airpump.
-Ryker

Mahjik

01-21-04 02:49 PM

You don't necessarily eliminate the airpump with a hi-flo cat.

The benifit is that you will be replacing something that's probably had it's time with something new. Most of the aftermarket hi-flo's are also lighter than the stock cat as well.

911GT2

01-21-04 03:56 PM

Re: Exhaust Question

Quote:

Originally posted by M. F. Luder
Hi all, Just a quick exhaust question for you. Can I use a 3" Hi-Flo Cat with the stock cat-back exhaust? Also, what are the pros & cons. Thanks in advance.

Yes you can. :)

Pros: Less exhaust restriction.

Cons: Less exhaust restriction.

RotorMotor

01-21-04 07:22 PM

ummm doesnt the cat need extra oxygen to process everything properly? i thought thats what hte air pump was for? if no extra oxygen is getting in there then my emmissions should increase drastically right? i need to be able to pass smog in CA

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