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crt,
Front engine?
Then the air box would need to be a lot noisier than the exhaust to make a difference. Noise follows the inverse-square law, and sound level drops by about 6dB for every doubling of the distance from the source.
Sound testing is usually half a meter from the exhaust, so a front engine, three meters away (?) would need to be about 18dB louder than the exhaust at the pipe!
In your case, 115dB!
An expansion box before the main silencers might help. No filling, just a resonance chamber.
JOhn
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