Idk why it's so popular to just put a filter directly on the TB, I wouldnt recommend it. IATs have a drastic effect on timing advance and KR. With my K&N fipk which has a full heat shield and everything on, at the track with the headlight out. My IATs would climb to 150-160* while in the staging area and staging the car. When I launched the car my timing would be at 14*, by the time I hit 60 mph the headlight trick would start to work, IATs would drop to 110-100* timing would climb to 16-17*. Then by 100mph iats would get to ambient around 65-70* and timing would climb to 20*.
With a filter on the TB it would have only got 14* all the way down the track, the k&n wasn't much better other than when I had the headlight out. I'm building my own fenderwell intake with a giant K&N filter on 4" piping and I've only got about $120 into it. Check my build thread to see pics. http://www.grandprixforums.net/99-gt...k-6-60217.html
