No, this is not another which brand to get question. haha.

I have the HRC stage 2 (not on yet). The downpipe is 2 1/4". And I was thinking about getting a 3" or 2 1/2" exhaust, and also either a 3" or 2 1/2" hi-flow cat to go with it.

But if I have a 2 1/4" downpipe, I wouldnt think a 3" cat and exhaust would work. Or will it?

Basically.... What size cat and exhaust will work/fit on a 2 1/4" downpipe? Thanks.

I have the HRC stock downpipe mated to my stock down pipe and flex section, then I'm running a testpipe and 3" Thermal catback. I haven't had any problems. It bolted right up because the Thermal is 2.5" for the first inch or so, then opens to 3".

You are not your job.
You're not how much money you have in the bank.
You're not the car you drive.
You're not the contents of your wallet.
You're not your fu**ing post count.

97 Eclipse GS - *SOLD*
01 Audi A6 2.7T
01 YZF-R6

I got the HRC DP mated with the stock DP, then connected to a 2.5 in. testpipe to a 2.5 in. Borla cat-back.

Kris
"Someday............I'll have traction problems!!!!"
Tampa, FL
Pinoy Turbo 2GNT

1999 HRC Turbo RS
Stage 2
Auto with BOOST!!!!!!!!!!!!

I have the HRC 2.25 dp. Last week i took it to an exaust shop and had them put a fitting on the end of the dp and run all new 2.5 pipe with flex back to a new striaght through muffler. No cat. . It sounds sick, not ricey at all! BUT i have not driven it since, i just got back from vacation. So right now im waiting on someone to pick me up to get my car and give it a run. My vortech fpr just came in too. happy happy joy joy!

____________________________________________________
four nails four corners four riders and four horses

You don't have to worry about the different sizes between your dp, cat, and exhaust. You can easily obtain a 2.25" to 3" connector connecting your dp to your cat or any other size connector. However, if you don't like that idea, a muffler shop can weld them together. Good luck.

Karl
97 GS
04 BMW 330i ZHP