take your time when installing the pipe, make sure everything fits, and leave the mufflers for last
put the bolts on but dont completely tighten
be patient and dont try to monkey it and it will fit great
try to force it and it will do you wrong
also, once you think its tight, make sure you turn the car on before you take it down and see if it smokes, but dont leave it on too long, otherwise pipes get hot
if they leak a little then try to tighten a little bit more and then smear some RTV Copper stuff around it to try and give it a little more
My h-pipe rattles against my trans crossover thing... but its cuz i jacked it way up so i wouldtn bottom out so much.. it dosent look so ghetto not hanging down either. But i love my h-pipe. It sounds so much better than my prochamber, and my torq is way better. Not as much power up top though...trade off. You will like it though, sounds mean.