Ok, i know before exhaust to get the fuel system straight. so after that i'm going to get the RB cat back exhaust. What are my options to improve the exhaust from the turbo to the cat. I'll be getting a high flow cat to put the RB exhaust to. Then what, does a downpipe go all the way from turbo to cat. or should i also have a presilencer before the cat?

 

just downpipe
It goes from your turbo to your cat.

 

I'm pretty sure the RB system is a turbo back? If it is you won't need anything else except a FCD.

I have been running a full 3" turbo back forever with the stock fuel system! just keep the boost under 10 psi and buy a EGT gauge!

 

if you are gona buy the RB cat back... spend the $100 more and get the whole thing LOL..