GS Bloke
Registered user
If you change the headers and/or tail pipe do you need to re-tune or do something to the engine to make it run correctly?
Not as long as the headers allow for the sensors to be fitted, they monitor the gases and adjust the fuelling etc for you.
If you don't have these then you may need a power commander, which IMHO is a but pointless.

1st class bit of kit good bark as well !!