Took a lil effort as with anything on these cars, had a few issues, first off the solenoid on my stock starter was in the way of the header. Not a real big deal because I changed the solenoid to the shorter one. Luckily the old guys at the shop didnt think it was worth their time to charge me for the conversion. Secondly, the crossover needed to be cut down a lil bit to make it fit just right. Again not a big deal just a lil aggravating when ur in a hurry to get the car ready for the midwest buick event in Indiana this weekend. And lastly both flanges on the crossover leaked real bad. I called Sam, and as usual he picked up right away and explained that he had a similar issue with the set he put on his car and gave me a Felpro part number that when used will seal the crossover ends perfectly. 23624 is the part number ($4.00 each). The gaskets worked perfectly, the car is quiet as a kitten. I used to think that alky was the best mod for the money but after fighting exhaust leaks from day one with my old Terry Houstons (on a set of headers that I was assured would not leak from a board member) I am extremely happy with the outcome of these headers especially considering the price and tech support. Thanx Sam for looking out for the Buick guys.