Usually, when an airbox is gutted or even an cold air intake is added, HP gains are barely noticible. In some cases, power is lost. example, my friend drives a 2004 Corvette 5.7L. Very nice car, K&N intake with three inch pipes all the way. Sick sounding bastard. Slapped it on the dyno barely hit 300 HP and 290Lb. FT. Very very depressing. slapped the stock air box and exhaust in, 350HP 345Lb.Ft. This happened because the parameters on the PCM were tuned for the stock parts. Now, he called SCT and asked them to send him a flasher to include a 100 Octane tune, Track tune, and an agressive street tune that included his exhaust, intake, and a cam he bought. Hasnt brought it to the dyno, but i tell you what, the street tune will pin you to the seat.


Moral of the story, if you wanna feel the power, flash the PCM.

You are so right. You can do as many bolt on'* and mods as you can, but to unleash their full potential you do need to make some adjustments to the brains.

The Corvette situation above is why I leave my alone and advise against tampering with the GXP airbox, unlike the V-6 airbox it is actually performance tuned for the engine specific and laminates the air and just before it goes through a complex screen/maf. Another case of probably messing things up. THe GXP breathes nice OEM and unless we ever see an aftermarket flashable PCM, that could increase fuel deliveries, change timing, and allow fuel/air mix alterations, it aint worth it.

Great desicion, a lot of people dont know about the design of an airbox. its made that way for a reason. It provides the right amount of volume for the air to travel nicely. it creates what is called the venturi effect. Which is why Volant makes an aftermarket airbox kit that has an airbox and not an exposed filter, the volume of the tubing before, in and after the box makes the air travel much nicer.

But, to each their own, me personally? I would gut my airbox just to hear the great sound! LOL!

HA! If I could tune the N* it would have cone tomorrow. But having watched the engine stumble just touching the maf screen, I leave her be. I put my nitrous jet just in front of it. only leaves 8 inches to the TB but seems to work fine.