how much would it cost for an extend port for a 89 na gtu? also how much horsepower would it produce if you have the extend port with a 3" straight pipe with a racing beat header?

 

Porting involves several hours of work PLUS rebuilding the engine. So you're looking at least $1200 for a quality job. About a 20% HP gain is a good number to start with. Oh, and it will be LOUD with a header and open exhaust.

 

does the $1200 includes them to take it out for you and to put it back in?
thank you for your post.