You probably could have kept the 2.25" setup you had on the car, added the cat, then put a resonator right after the cat where the original resonator was located on your stock piping. I used a 25" Thrush glasspack (20" canister). Remember, there are no significant gains from removing the cat on the SR20's. And the OEM cat is already a decently freeflowing cat.<font face="Verdana, Arial" size="2">Originally posted by Sheabird:
now before...my car had custom 2.25" piping into a straight through muffler...It had that continuous back-firing sound when i let off the gas...it just was bad...I also have HS headers and pop charger...I have no clue why it did this, but I ended up adding a cat and putting a stock muffler back on to get rid of it.
If you have it available, read the article in the November issue of SCC. Mike Kojima wrote a great article on custom exhausts.
'96 G20 ($tillen/K&N intake, '91 intake cam, 17 degrees, custom 2.25" Borla cat-back exhaust)