If I add a tubular header, all other things remaining equal, what changes can I expect to happen to my custom tune?

 

Nothing much to be honest. Might be able to get a .5 or so more degrees of timing in there if you were running the stocker to restrictive boost levels. But that's about it. Oh.. and check your boost level. The boost table may have to be adjusted a few %. Rock on...

Shiv

 

Thanks Shiv!