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When I added a bmc drop in filter, together with the ipd plenum, the intake became alot louder although mine's not desnokled.
I guess the freer flowing bmc filter, with the elimination of the air resonance box on the stock pipe, the larger tb and presumably the smoother flow of air through the plenum, all contributed to create more noise.... and it's a nice noise... Car used to be too "civilized". Now, if I can improve on the exhaust... without causing a headache on my regular 3 hr highway commutes.
In my case, the noise increases significantly after 4k rpm... loud enough to startle my sleeping passenger....
Last edited by shlim8; 11-05-2011 at 06:23 AM.
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