Exhaust Question-- Cat Size
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Joined: Jul 2004
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From: So Cal
Car: 1987 IROC Z
Engine: LB9
Transmission: 700-4R
Exhaust Question-- Cat Size
Guys
I was wondering what performance difference in terms of HP would I be looking at if I replace a converter with the 2.5 inch (inlet/outlet) with a 3 inch Hi-Flow cat. The rest of the exhaust system is stock 3 inch thru Magnaflow mufflers.
By the LOOKS alone it looks restrictive at the cat and the welding looks kind of "sloppy"... will there be any noticable difference in drivability if I were to get the larger cat converter? The IROC doesn't have headers. AND will the lower back pressure (if any) change the EGR functionality. I live in CA and get a little paranoid regarding the SMOG ****.
much appreciated in advance.
I was wondering what performance difference in terms of HP would I be looking at if I replace a converter with the 2.5 inch (inlet/outlet) with a 3 inch Hi-Flow cat. The rest of the exhaust system is stock 3 inch thru Magnaflow mufflers.
By the LOOKS alone it looks restrictive at the cat and the welding looks kind of "sloppy"... will there be any noticable difference in drivability if I were to get the larger cat converter? The IROC doesn't have headers. AND will the lower back pressure (if any) change the EGR functionality. I live in CA and get a little paranoid regarding the SMOG ****.
much appreciated in advance.
Last edited by Zink57; Oct 5, 2014 at 11:23 PM.
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