I have no cats its only long tubes true dual and super 10s going to the side exiting to the passenger side its a 2001 chevy silverado with a 4.8L used to have a 5.3 but the boy blew a piston and planing on putting a lq4 and a turbo in it ive been trying to make this truck do some sick burnouts but the truck doesnt have a traction control button so I zeroed everything on the traction control and it still tends to hook and all i get is reving and no smell of tires and the crackle and pop i dont know how to do with out the engine blowing up on me heres the file if u need it see wht i have to do.2001 chevy silverado 5.3 attempt #2.hpt