well thinkin about upgrading to a 4in full exhaust(mods on sig) if i do that will i need a retune?i have AMS DP and rsr exhaust not...so goin full 4in with JUN tip hopefully....let me know if ill need a tune again

 

yes you need a tune everytime you switch something to optimize the mods.

 

Also check into ground clerance. If it is a DD you might find yourself bottoming out the exhaust.

Just passing on a heads up I was given when I thought about gettin the 4'' on mine.

Good luck

 

thanks guys....if i get the 4in can i put it on and not run it hard?like wait till a tune?cus im in hawaii,kinda hard to get a AEM tuner here...would i feel a difference even without a tune,is 4in to big?thanks guys

 

4" is overkill, I would stick with the 3" and if you do change the exhaust you shouldn't need a re-tune

 

if I had all those nice mods I am sure some tuner would love to be flown over to tune your baby up...

sry, I can't tune

 

No reason for it IMO...unless you are pushing 700whp+. Why not just optimize what you have? Do you go to the track, roadcourse, or is this just a street play toy?

 

I don't think there's any reason for a 4" exhaust.