Well... I got a mac o/R H 75% installed. Everything went smoothly (as smooth as it can w/o a life laying on your back lol) getting the factory crap out. However, on the DRIVER'S side, the two studs came out with the nuts, so now they are stuck in the stock H. So I went to the dealer I work at to buy new nuts and studs, and of course they have the nuts but no studs. So now my car is laid up for a few days for several dollars worth of metal. I fired it up for sh*ts and giggles, and the passenger side is all done, so on the right side it sounds like a muscle car, and on the left side it's open manifold so it sounds like a truck. I can't wait to finish!