I'm upgrading my exhaust to 2.5" piping and curious as to what cat converter I should use. currently I'm running 2.25" on my LD9 and using a Magnaflow 91035 cat. I constantly have a CEL for the P0420 code. I've been told that this is because the cat that I have is too small to handle the flow. I'm wondering if going to the 91036 would be alright (same size as the 91035, just a 2.5" inlet and outlet), or should I use a cat that's a bit longer (the 94036).
this of course will be going in after my L61 swap, so this upgrade won't be used on the LD9.
Desert Tuners
“When you come across a big kettle of crazy, it’s best not to stir it.”
i will be using the 94036 with my 2.5" setup. i'm just waiting on cti to ship out my piping
yeah, I'm just waiting on Willy to send me an email back on payment options.
thanks for the assist man.
Desert Tuners
“When you come across a big kettle of crazy, it’s best not to stir it.”
I would get rid of the cat altogether. I put in two 18" resonators, coupled with a high flow muffler, and it sounds very nice. Plus, it looks like there is a cat and resonator in there, so the cops don't bother me.
Otherwise, if you are set on putting in a cat, go with a Magnaflow. The reason I didn't get a cat is because even though they make a cat which has 2.5" inlet and outlet, the center diameter of it is actually smaller than that, which defeats the purpose.
2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
I've been using a Catco 2.5" High Flow from Summit for the last 6 or 7 months. I have that coupled on my L61 w/ a 22" resonator 2.5" piping, and a straight through muffler. I have yet to throw any codes at all. Car does smell like it runs a little richer though.
