I recently got a k04 swap and my exhaust done. I replaced the cat with a test pipe. Now my car bogs when i push it past 5 lbs. I cleaned my MAF but no affect. i think it's my oxygen sensors. I have an ABS, check engine and traction light on. Any one know where I can get the right oxygen sensors cheap? I got them from strauss, but somehow they ended up being the wrong one. (?)

Can anyone help...I havent even felt the full potential of the swap yet.

so you are running stock tuning?

go to autozone and get your codes read asap...

did u ever change your DV?....sounds like a vac/boost leak

I'm sure some1 on here will have a bit more insight

gl!

Codes please. Not going to be able to figure out what the problem is unless we have some codes. Did you upgrade your diverter valve? I'm assuming that you have programming for the K04, or are you running stock programming. K04 with stock programming will run.....stock.

I have the car chipped (93 octane chip not GIAC k04 chip) and i upgraded the DV. Going to get the codes now!

you need the K004 file from whom ever made your flash, its ging to be diff then a K03 flash

Okay I got 3 codes.
Misfire in cylinder 2
Maf sensor
O2 sensor 2

I had all those codes in my '01 1.8T , I replaced all coilpacks+02 sensor+ MAF and haven't had the slightest problem since. Chances was the MAF went bad @ 100K but who knows...replace that shieet