i have a performance exhust (zigen) on my car and had a hks panel filter on the car when i bought it which i thought made my car quicker than the standard car,but now i have just replaced my air filter with a hks super flow and i now think goes like stink !! and sounds good too
There are gains to be made with N/A and a air filter is a good start.
A mate and I went to the drags last year his car was stock standard, mine is modified (air filter & exhaust) both were R33 gts25 (both auto). After I kept beating him down the strip we decided to see the difference just an air filter can make. So we pulled the K&N panel out of my car and put it into his and ran it down the strip, and the improvement was immediate an full 1/2 sec quicker down the strip.
My GTS25 has a 2 1/2" stainless steel exhaust system, no cat, extractors (6,2,1) and a K & N panel air filter.
Last dyno it made 112.4rwkw (150rwhp) and 475Nm of torque.
By doing the air filter and exhaust it should give you an extra 12 to 17 hp at the rear wheels by adding a set of extractors you should get close to another 6hp.
If your car is manual it will make an extra 15-16hp at the rear over it's auto counter part.
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