Originally posted by tour96se:
to get the most from the headers and your other mods you really need to get that thing dnyo tuned,or at the very least a ADC sct chip..theres still a few things you could do for some hp,have buckshott optimize your tb,optimize the lim(use locktight!!) have the uim max extrune honed,headers and a good y pipe,2.5" exhaust...


Although mostly good advice, I have to dispel one myth....
Tuning required for most mods, this is no longer true anymore.
When at one time this was accepted philosophy, we have now learned through trial and error as well as from the new tuning software that there is NO need to tune intake and exhaust mods.

The reason is simple. Improvements to the intake and exhaust which increase airflow will automatically be compensated for by the PCM adding fuel when the MAF counts more air coming in.

You dyno tune when you need to alter the air fuel ratio that the factory has set. Most factory A/F is set quite rich under wide open throttle so we tune to lean it out a bit and so doing we gain power, sometimes lots of power.
The other thing we tune for is increase timing so to make more power and stay on the edge of not pinging/detonating.

So he can optimize all he wants, put headers on and open up his exhaust/intake and he won't need a dyno tune at all until:
- he exceeds the capability of his MAF to count air mass
- he exceeds the fuel delivery capability of his injection system
- or he wishes to alter preset factory air fuel, timing, or other things.

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black