Steve,
I don't want to modify the header before the collector if I can help it. With the tranny and engine raised I don't think I'll have to but I have to drop the car off the jack stands to see how it sits. Maybe something to do before the weekend.
I didn't want the stock header because it's really restrictive and I'm converting from a twin turbo to a single turbo setup.
Chris,
Those seats are almost exactly the same size as my new seats. the Corbeau fx1 didn't fit so I swapped them for fx1 pro seats which are very close to the dimentions on your seat. Have you had much track time with your seats? How do they feel in day to day use?