I have a 4.2 V6 and i want a programmer but i dont want to void my warranty will this? and also what should i get?

 

A 4.2?

 

Superchips and Hypertech both have flash tuners for the 4.2L. I am sure that both would be fine if you are just looking for some pep. I am not sure if Troyer does custom tuning for the 4.2L, but you could find out. Anyway, as with any modification, your warranty will be voided if the mod caused the problem. This can also be subject to your particular dealership. Good Luck.