My M80's had an overall length of 18", 4" round tube length of 14", 2.5" in/out. Anyway, I located mine about 6" back from the h-pipe connection. I don't think there is enough clearance to install the resonators directly to the end of the h-pipe. Once you get under the car, look at the over-the-axle exhaust pipes, pick-out the straightest section of pipe for the install. I'm really anal, so I totally removed my over-the-axle pipes (already had them marked for cut points, bottom & side locations, etc), cut out the sections that need to be removed, welded-in the the front section (6" piece) onto the resonator, and then tacked the opposite end of the resonator to the remaining pipe. Then I crawled back under the car, located this section to make sure that everything was going to fit right, pulled it back out, finished welding it, re-installed, and repeated the steps for the other side. I did all of my work while the car was up on jackstands and the welding was all done on the garage floor. Since I don't have a lift, the way I completed mine seemed like the best method. Plus I wasn't going to pay someone to do something that I'm perfectly capable of doing, and I didn't want them molesting her either! Please let me know if you have any questions, I may be able to give you some helpful hints. Here's a picture, sorry for the poor quality, taken with my cell phone.