I just got my Mazdaspeed Axle back last night...and i couldnt wait for help so i did it my self in my garage (and i am NO mechanic) with a 14mm rachet and a couple bricks i drove onto so i could get under my car, it took me about 30 mins, and the hardest part was getting the old muffler off the rubber hangers.....the mazdaspeed is very cool, nice low sporty tone, doesnt sound like a ripped up tin can rattling around back there, and like im sure many have told you, your not going to see huge gains in the HP department but there is much better throttle response and is a little "peppier", i hate that word but oh well, good luck man i vote axel back stay away from crush bent ....L8ER