Seems everyone has problems like this! me included
If your after a O2 sensor have alook in the traders sections KUDOS MOTORSPORT do a deal for SAU members i think i paid $77 for my ntk o2 sensor? great service and quick delivery as well
Unfortunatly it made no difference for me lol
I have just removed my BOV and replaced with a stock one....ive only driven it for about 50km but straight away noticed the car running nicer, gear changes are alot smoother with practically no backfire. It cleared up the spluttering and poping under engine breaking and so far seems to have made a huge difference, Ill have to let you know how i go on my first full tank.
I never knew stock gtst r33 put out 184...ive got similar mods, FMIC, POD, EXHAUST, HI-FLOW TURBO, Jaycar boost control. Havent had it on dyno myself but the printout that came with the car when i bought it only read 179rwkw