Product impressions, products supplied by http://www.autophysics.com
|K&N Re0930 on the left and the Autophysics 7" Powerstack on the right. The K&N has been on the car for a few months so it's a little dusty.|
|Autophysics 7" Powerstack installed on the Hotshot tube. It's a little longer so hangs down lower, but the filter fit the tube better and slipped on farther making it hold better on the Hotshot tube. This is important because I lost a K&N filter off the car. (The PowerStack is also available in 5" and 6" lengths.)|
To come the test of the 5" quick change unit, a replacement intake system.
The 5" filter is supposed to flow up to 1000 CFM; I'm guessing that's using both elements. The inlet hose only feeds into the small central element, which I would guess will flow only 300 CFM by itself. Since this is just a filter and a corrugated plastic intake tube, you have to fabricate mounting brackets yourself. I went from what I remembered of Brian Young's custom airbox install, and started bending strips of steel into Z's and U's to mount the VAF, "boost sensor" (whatever the hell that is) and other orphaned components. This took about 3 hours to get everything shaped, fitted, and mounted. Right now I run the hose to the scoop-shaped cutout in the underbody cover. Eventually I'll find an actual scoop to mount there. So far the only obvious difference is the intake sound. I've read too much about psychological bias to infer anything about seat-of-the-pants response. (I will say that I tried flooring it in 5th gear down the freeway tonight, with no cars around. Hit 125mph before I chickened out and encountered traffic. Nice sound...) It occurs to me that this might be an excellent care-free system - if the scoop gets submerged in water, the exposed filter segment in the engine compartment will still be flowing air. -thanks to HC 14Jul99
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