Originally posted by Ray:
What do you think a heatshield does? draws air only from the cool side.


Without the heatshield the performance of the filter in raw CFM's is still better (MUCH better) though heatsoak at idle will hurt performance, bringing it much lower (back to just "better" for me)


Ray



And what do you think the SVT airbox does? Gets air only from the fenderwell.

Beyond better filter material, there isn't much intuitively that would say why an open air filter would be better. Now, if dynos show that the open air filter truly is better, then so be it. I'm just looking for the science behind it.

Oh, and that better filter material is also available from this K&N drop-in filter replacement

3.0L 98.5 SVT - John Edwards 2008