die_lawn

i replaced my stock y7 headers with the cat less y8 headers, since there is only one o2 sensor on the headers themselfs, does it really matter where i place the second o2 sensor or does it need to be a certain length down the piping.?

MHDesigns

Are you running with no cat at all? generally, if you change that header, you would add an ex model cat after the header, which would receive the o2.

die_lawn

oh umm i'm not gonna be running a cat. should i do a test pipe with o2 sensor hole?

MHDesigns

yep

Unseen Racer

^^^^^^^^^
x2

if you were running a cat, you would
need an O2 before and after the cat

MHDesigns

You mean before and AT the cat...?

die_lawn

ok awesome, thanks alot. i was just making sure cause the headers only had one o2 bung. and i wasn't too sure haha

ej8ster96

not to thread jack, but, with running a test pipe w/o2 sensor, will it give you a CEL??? I ask b/c i think i have something messed up in my cat, cuz it rattles a little and i cant seem to fix it, so i was just going to run a test pipe, but my dad said it would give me a CEL.

sde780

how many headers do you plan to run?

die_lawn

Umm I plan on running the bisiMoto v2's when I'm ready to give up my A/C haha

Unseen Racer

well its pretty much at the END of the cat. so i consider after.
but for correction purposes, yes. before and AT the end of the cat

alls2k01

running a test pipe shouldnt throw a code from my experience, as long as your running the 2nd o2 sensor

ej8ster96

thanks!!

die_lawn

thanks for all your input everyone!

MHDesigns

You probably will throw a code.... Easy fix. look on ebay for an 02 fix kit, or test pipe kit. You will find a piece that spaces the 02 so that it will take an accurate reading. The code wont effect performance, just wont let you pass emissions.

ej8ster96

ok thanks,i dont have to worry about emissions in alabama