I was just wondering if I only put an downpipe, intake, and BOV on my stock FD will I need to put an ECU or more fuel? Is it worth it to put only a downpipe without a midpipe or a catback?

 

No you do not need to adjust your fuel mix yet.Yes its worth putting on the downpipe now without the rest of the upgraded exhaust componets. It will move heat (apx.100 degrees) away from your turbos.Plus you'll pick up some hp.Why would you want to put on a blow off valve on now? You said your self your car is stock.
Your car already has a blow off valve that works fine.
Unless your running extremly high boost you dont need to upgarde this.If you just like the Phsssssst. sound your aftermarket intake will do that.

 

Yeah, I agree. I wouldn't even worry about a BOV. Do you have a A/F Ratio gauge??

 

What he said . I'd go with a catback and downpipe. You'll save about 50 pounds of weight (the stock catback weighs a ton) and gain some decent hp, maybe 10-15 at the wheels with everything else stock. Throw a K&N in the stock airbox, and you're ready to go. Don't spend your money on a BOV, Fd3Boost is 100% correct. If you have 250-300 bucks to spend, I would invest in a 60mm Greddy air/fuel gauge (w/peak/hold and warning). I've been told that it's a very accurate way to measure how rich/lean you're running--might save you a motor in the future...

 

Good call I forgot all about the ridicoulus weight that thing has.Yes Death to the pre cat!!!

 

yea get the boost gauge and air/fuel ratio gauge. loose the BOV. I had the HKS SBOV the sound is cool but then I sold it, cause need the cash.