What would yeild more gains....
I would say Stall and a Tune, or Stall and Headers.
Or even Stall, Tune and Headers
Not sure on the Kit price, but I'd think a stall would be less than the kit, so the savings can be used on the tune. Now i'm running a 97 M6 with 3.42s, after the LT headers install with Ory (eleminating the cats) it picked up so-so, but the torque was VERY noticable down low, a cam/rocker change in mine would spell wonders i'm shure, but you really need a good flowing exhaust to balance things out & benifit a cam, plus at this level, a tune is VERY benefitial, so bottom line, do the exhaust first, but IMO, the cam/rockers are worth more power, but without the exhaust, you'll be putting the cart before the horse.
As for a gear change, i myself wouldn't put a penny in those 10 bolts with an M6, thats why i upgrated to a 9"
If you want the cheapest HP gain, throw an NX base system on it, easy 12s & over 110 MPH with what you have.
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