tuning

[steve b.]

aren,t you supposed to tune after all your mods and not before steve b.

[Devilish34]

aren,t you supposed to tune after all your mods and not before steve b.

Both if you wish but definitely after you add something that changes air to fuel and/or exhaust pressure(headers not so much for a cat back)

[johnh]

No you tune for the mods you have.

Otherwise I'd be tuning for a Supercharger...