What do you do for more HORSEPOWER???

[n.gardner]

I have an '02 XLS 4.0,
I have a Mod airbox and a new filter, I regularly use fule additives to clean the injectors.

What do you guys do to boost yout HP?

THANKS !
Nick

 

[matt0248]

Exhaust systems and custom tunes seem to be the common things to do. Some have used underdrive pullys, added electric cooling fans instead of the belt driven fan.

 

[JDT]

Yea from the Y pipe back cut out the rear cat resonator thing and run 2.5" pipe all the way back with a tune and it'll be a beast

 

[CALDWELL]

Good Tune Up - Intake - 2.5'' Exhaust - Tune - Synthetic Oils...

these are the basic mods, with good gains for the " Butt Dyno " lol

they could possibly net a V6 I would about 20-25 HP/TQ