We've found 4 smaller holes in the front face (the sloped part) of the airbox lid tends to produce the best results. You can also always tape off two of the holes if it gets a bit cold to richen the mixture a little if needs be.

Cutting the back off the lid makes the induction noise substantially louder, which while it should, is not to everyone's liking.
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Andy.
NSR-WORLD.COM

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