Originally Posted by DynoFlash

The stock air box is an excelent unit but it is designed to accomidate a large range of priorities, eg. sound deadening, water protection, filtering and cost considerations

Most of the widley used aftermarket intakes, e.g. HKS RS, Buschur and APS all change the manner in which the MAF sensor reads the air flow and result in tuning variations

However, on these well made units the distortion is BOTH consistant and repeatable. Hence, once the changes are noted and measured, they are uniform from car to car using the same intake with the same mods.

I like to say that each air intake has its own air flow "signature"

I disagree with those trying to say that the well known aftermarket intakes will create a uneven or distorted mass air flow reading with turbulence - this is NOT the case

With proper tuning to compensate for the intake's air flow "signature" a aftermarket will make more power than the stock air box in every case

IMHO - the reason why many tuners may not recoemend or tune for intakes is that with through the mail or base tuning you have to create a whole set of maps for every different kind of intake which is very time comsuming

I offer unique tunes for all the major intakes

Here is a A - B comparision of the HKS RS Intake kit vs the stock air box and K & N drop in on the same car - same mods - both tuned for flat 11.1 / 1 a/f ratio

The gains from the aftermarket intake come up on the top end after 5200