I have a 2004 tahoe with the 4.8l engine... thinking of adding an exhaust, but nit sure if it would be woth it on this engine...see alot of work being done on 5.3l and 6.0 but no 4.8l.. also take any suggestions on exhaust.. was thinking corsa, but dont see an application for 4.8l just the 5.3l...