Not Ranked
Good point, and yes I'm VERY skeptical of such horse power claims in the "real world" by simply bolting this or that on.
I think these hp gains are not done in the real world. They are done in a labratory type environment. No doubt K&N filter will increase hp. But will it be 10 to 15 hp for the "average" application? Gimme a break! 10 to 15 hp over a poorly engineered factory setup MAYBE. Find a particularly offending vehicle with a lousy intake design. Put on the new K&N filter and measure the dfiference. OK test looks good, print the Ad! OR the hp gain could apply only at extreme rpm conditions to certain vehicles with OTHER modifications all ready in place. Same thing for windage tray. Zero impact unless your talking high rpm and in CERTAIN conditions with CERTAIN vehicles.
My opinion, and I could be wrong (nah, not possible):
Generally speaking ALL the above items are "good". Generally speaking NOT as good as the "Ad" states.
Ernie
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