my buddy is willing to sell me his apexi N1 for 150.
heres the problem/blessing; its for an HX so it is longer than the one that is made for an EX because the hx/dx/lx cat is found up top.
now my figuring is, i can just take my cat off completely and run strait n1.
in my head/ theory that sounds right... doesn't it?
if i remove my cat, the HX exhasut should bolt right up prefectly. or at least thats what i think.

now, for the second most important part. i have obd2 which means i have to have a sensor somewhere down by where the cat USED to be. i assume my car will throw codes because its freaking out thinking its running to cold/ clean whatever. has anyone used a strait pipe on an obd2 and left the sensor hanging or tuct it away???? any experience would help greatly. thnx.
how do i trick the car without switching OBD's?

 

you can get a simulator: to fool it or:


order a testpipe with o2 bungs for your sensors: 60-80 bucks shipped:

 

but wouldn't that just have the o2 bung plugged in and realizing that the catalytic converter is failing and throwing you and a check engine light? And where would you get this simulator?

 

i just researched the simulators, you can make them yourslef but seem sketchy, not reliable.

my original plan is to weld a bung on anyway.

i just wanted to know if anyone is running a strait pipe on obd2 without throwing codes and how they do it.

i have also just heard on another board, that the secondary 02 sensor's soul purpose is to make sure the exhaust is still flowing. so running rich/lean/stoich doesnt even affect it. this is just what i have HEARD.

 

i unplugged that o2 sensor.. no codes..

 

If that exhaust theory does work have a o2 bung made into the pipe. Then get a o2 sim. Yes you can make you own. Yes they work if you know how to make it. I did my own. No problems since day one.

 

anyone sell these sims? I'm running no cat and i'm sick of my check engine light...

 

spuddy, how did you throw no codes?????
you just unplugged and NOTHING happened??
thats the kind of solution im lookn for.

 

Don't know about other people's experience but I made 2 bungs in my straight pipe and stuck both O2's in. No check light. This was on a 97 GS-R. I don't know if year model makes a difference or not on this matter. I tried leaving one in and one out but that resulted in a check light after I drove for a few minutes. Good luck.