I finally decides t o get for WB pro meg pipe since it adds 4-7 hp. i was wanderring if i had to get a complete package that can with header pipes or just the muffler part cause its alot cheaper without the header pipes

 

I've been doing research in here and went with the s-bend. they say that it gives less than the promeg powerwise but the promeg is for more of the top end power(that's what I was told by a wb dealer). My pipe should be installed and jetted by friday. I'll let you know how it performed before you spend 450.00 for the promeg.