I currently have a stock downpipe. Could I run an aftermarket 3 inch downpipe to stock catback? Would I also need a tune if I just change the downpipe or would it be ok to run with stock ecu?
Yeah I've briefly looked into xr5 exhausts and I've gotten mixed replies, some saying that there isn't much modification required and others saying there's too much modification required, but if need be its always there as an option.