1badCB

Im getting ready to redo the whole exhaust on my car...headers and exhaust. Im also deciding to go with a high flow cat since i dont want to deal with the headaches of test pipes or straight pipes. My question is if I put on a high flow cat, will my O2 sensors throw a CEL? I dont see why it would come on since i will have a cat on, but Im just worried because the flow of exhaust gases will be much greater with my exhaust setup rather than stock setup. Any help is appreciated!

lilredlude

my carsounds high flow never gave a cel

__________________
If you don't know what you want, you end up with a lot you don't.

okc405prelude

if installed properly no. Had a rattle underneath my car and went from Oem to magna high flow. Took the noise away and cant really tell a difference between the two. The mechanic even showed me my old one the honeycomb like center was very clogged. So i know it should run better. Another weird thing was the box said not california approved. So Im Guessin it wouldnt pass smog (the one I have)

dontbuyprelude

if you do get a cel just make an o2 simulator. search if you dont know

__________________
David
01 SSM SH

93 d15 auto del slo gone and FORGOTTENexcept for a few memories....

knbond1

I have the magnaflow direct fit high flow cat and mine throws a code, even tried 2 different o2 sensors both new just to make sure...

__________________

Dog_of_War

Homebrew O2 Simulator - Simple and cheap and effective

__________________

-Aaron

bouckarooo

i have amagna flow and no cel, however when i got mine i bought one with two bungs in it(before and after cat), i plugged the one with a bolt and the other with my o2 sensor, no issues here, truthfully i like the magna flow but dont really notice any power gains however i do havce a stock exhaust on the one that has it.

1badCB

Alright, well i hope that when i get my exhaust done there wont be any problems....by the way, will a high flow cat quiet the sound of my exhaust some because im a little concerned about how loud my exhaust will be. Im putting on a SMSP 421 header w/ a Apexi n1 cb exhaust. What do you guys think?

Kronn 98SH

I think you're spending a ton of cash for a few hp. The cat has little effect on the tone, when you're talking about this cat vs that cat. However, it has a pretty big effect when talking about cat vs no cat.

__________________
1988 Prelude S - victim of an 80mph backflip
1991 Prelude Si - sold
1989 Accord DX - impounded
1998 Prelude SH - totaled on 3/29/12
2006 CRF150F - sold
2006 YZ250F - sold