which chip or tuner is best

[ZPennell]

looking to upgrade my 03 ctd,want to buy a chip ,witch one to buy?

 

[JHardwick]

That's broad and general a question with all of the options available. You'd be better served by using the search function to find the tuner that fits your needs.

 

[BRayls]

tst is my choice. stacked later with a smarty ,and a , well it never stops.