Ok, I have a 3.3L 1st gen Intrepid. I have made a custom intake that is a tad over 3" in diameter. I know I gained some horsies from this alone but I was thinking..... I'd have that 3" pipe to start off with that goes down to a 2 1/2" or 2 1/4"(TB is 2 1/4" I think?). I'm thinking what will happen is that I will get a good mix of air volume and air intake speed to provide the most even powerband throughout the RPM range. And possibly increased hp and tq gains. I really wish I didn't have to engineer this myself, it'd be nice if SOMEONE specifically made a 1st gen intake for the 3.3 and/or the 3.5. Also has anyone tried those heatshield filters in comparison to the normal style? Are there brands you prefer? Any help and/or ideas are appreciated.