Airbox lid chop

[hooptygoo]

Besides cutting wholes in the top and bottom of the box, anyone remove more material than that? Like from the canal area or the empty space next to it?





Oh and what's with the spare change pocket?

[eezz]

I'll be pulling mine apart to examine what material can be removed and still filter the air.

[hooptygoo]

And are you guys keeping the Velcro foam cushiony pad thing or ditching it?

[dave2riff]

The "spare change pocket" (cavity along the side of the airbox lid inlet passage)
forms a resonant chamber to further reduce intake noise at some frequencies.
At certain RPMs, the air intake pulses can crate an annoying "chuffing" sound,
and the stock airbox lid is designed to reduce that. Once the exhaust has been
modified with aftermarket cans and no "dB killers", the intake silencing becomes
not very significant, since intake noise at some point will be overwhelmed by the
exhaust note.

[GMP]

Anything else is pointless and some areas will open the clean air side of the box. A straight shot to the ID of the filter from both holes is as good as it gets.

[dhc8guru]

My HM is stock and I just cut open a round opening directly over the airfilter (where the Duc symbol is).
I figured between doing that and the original existing side opening, it would plenty. Thats basically what the DP air lid is.

[hooptygoo]

Originally Posted by dhc8guru

My HM is stock and I just cut open a round opening directly over the airfilter (where the Duc symbol is).
I figured between doing that and the original existing side opening, it would plenty. Thats basically what the DP air lid is.

That's what I ended up doing. Sounds great (exhaust seems throaty-er), rides great, feels great. Easy as pie. Life is good


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