Quote:
Originally Posted by Nismoracer
So does this mean the HPS tubes aren't worth it either? Best thing to do is just get some drop in K&Ns. I noticed a difference from just putting in the drop ins especially up top. Seems to breathe better at the higher rpm range as to before it seemed it bottomed out went flat.
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At this point, I'd say not really. Honestly, I may eventually just sell mine off.
I found
at best a 2-3 whp (i.e., ~1%) gain at peak with evidence of a 2-3 whp loss at other points and no change throughout most of the rev range. Never mind the possiblity that such a small change could be due to measurement error...
That's a dubious endorsement at best...
I'd say, the HPS tubes couldn't hurt, but they won't be much of a help over the K&N drop in's alone either.
On a budget, the K&N panel filters by themselves are definitely the way to go.