Originally Posted by maizer89
I had a open source pro-dyno tune with the cobb catted dp and the stock exhaust, so with adding the q300 exhaust and switching out to a 3in invidia catted downpipe I probably shouldn't worry about a tune right?
Well, the downpipes are different other than the taper. Cobb uses a belmouth design and Invidia uses divorced. How this will effect youe tune, I don't know ... Never tried it myself.
My guess is that the tune will be off since the flow will be different, but you won't know till you log it.