I am looking at puitting a 4 inch turbo back system or a 4inch cat back.I cant decide because i dont know if i should leave the stock cat on or get a delet pipe. In addition will there be a power difference and if so how much. Or should I go with a high flow cat but I dont know if they are legal.

 

vehicle?....... just remember removing the cat could cause warranty headaches

 

Just run a cat and go mufflerless.

 

best bet get the cat delete pipe best way to go and keep your cat just in case!