5" downpipe
 

Does anybody know where I can get one for a 2001 Cummins with a stock turbo?

nope...it would hurt performance anyway.

ive only seen a 4 inch downpipe that changes to 5 inch under the cab. you dont need a 5 inch, you'll kill your low end power, especailly torque, unless you are heavily modded, a 5 inch isnt worth it.

I have a friend with a 5" dwn pipe but his is a CR. He even had to hammer in the floorboard to make it fit. 4 is plenty good and then a 5 the rest of the way back.

ok, well thanks for the info guys. I didn't know it would actually hurt me. So do yall know where I can get a 4" then?

any of the sponsors here can help you out with that. post up a price quote thread and they will shoot you some PM's.... i'd look into a full exhaust as some of those kits are going crazy cheap nowdays.....