I will be installing some pacesetter lt's, whenever they arrive. Do I need to have my truck retuned after they are installed, currently tuned with shorties.

 

While i cannot comment on firsthand experience for installing Longtubes, but generally my experience is.

"If you change it, you gotta tune it."

Chances are, it wont effect your tune as it is, but to get the most benefits of your LT's you will probably have to get a re-tune.

 

do your current shorties have cats? With the LT's are you !cats? If so then I'd say yeah you probably should get it retuned. You can always push a no cat car a little more to get a little extra power out.