A 65mm TB has shown losses on every car's "posted dyno" testing to date. From near stock to moderately modified.
Personally I can not tell the difference between my elongated & optimized 60mm and the optimized 65mm. I am currently very heavily modified & normally aspirated.
When I tested them last fall the 65mm lost power. I would have considered myself medium to heavily modded at the time.
Personally I would ditch you current airfilter. Get a K&N. Plus I would clean the MAF element (electrical parts clener & a Q-tip)
