Just a bit of my experience. As I said in last post, no templates available as far as I know. Mine came with head flanges nearly cut between 1&3, 5&7, 2&4, 6&8. It's best to cut those flanges thru thereby separating 3 sets of pipes on each side. Install can then be done with a minimal of cutting (collector installed after the fact).
My experience dictated notching of both shock towers (ouch) but I did it. They also required cutting where the collector exited the fenderwell to underneath the car. You probably will also encounter rubbing of front tires on header tubes limiting turning radius. I did. Spacing front rim out as far as possible via rim backspacing will help.
Other than that I love these headers. Somewhat of a PITA but worth it. I ran these on both street and strip and they do cook. :) Speaking of cooking they do put a bunch of heat under the hood. They caused my fiberglass hood to warp a bit in places. Sucks.
I had mine coated inside and out by Jet Hot and they have held up well. They still look good although now laying in my floor board as well as a bunch of other parts. :) Just a few thoughts for you to consider.
