Very good kit! We installed the American Thunder 2 1/2" kit on my '70 Chevelle. Great fit. We had to cut approx. 10" off the pipes to allow for the headers, so I would say there is room for adjustment for different length headers. There is also a crossover pipe already welded in place. The kit also contains both straight out pipes and turn downs. You will want to have the kit welded as recommended in the directions. Also, We added a set of bolt up flange (not the right term, and misspelled - sorry) behind the mufflers. This allows the whole exhaust to be unbolted and removed from the car. I have not been able to run the setup on the street yet (other problems!!!), and I can't wait! I got my kit w/ a pair of 3 chamber mufflers for $280 from Summit. A buddy of mine has a Torque Tech Kit (more Money$$$) and the Flowmaster kit is as good if not better quality, and better fit. Just my opinion. Good luck! David
[This message has been edited by David (edited 11-11-98).]