BGC had a kit a while back, i am not sure if they still have it, but i had one on my car and it was awesome. It starts as 4 inch at the filter which is located behind the headlight, and is also closed up in a box type thing that was made of fiberglass, then it would go through the core support and gradually get to 3 inch where it would connect to the MAF sensor. It also came with the drivers side air dam that had the hole in it and you mounted the box that the filter was in to the air dam and everything was great. It was "supposed" to create a ram effect and be cold and stuff, i liked it, they might still sell it, only thing is that it is 300.00 and i am getting the Big Mouth now, haven't got it yet, but should have it soon, i am very excited, it has the same kinda idea, mount behind the headlight, and i am getting it with chrome pipes, i can't wait. I would suggest the Big Mouth, it looks extremely clean, but i was just telling you about the BGC wondering mostly if anyone else has seen it or used it. Laters
NHH
edit: spelling correction(i think)