i am putting my 20s on in about a week and need something to correct speedometer and shifting. and since these 2 claim to do the same thing i was just wandering which 1 was best.i also plan 2 get some asm headers a borla catback and a upd intake later also which 1 will make the most of those mods.

 

Go with Hypertech.

Its best to usually begin from the back to the front. Exhaust, headers, and CAI. Let that engine breathe. You'll really start noticing performance increases once u get those headers on as well as the HPPIII.