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03 crf459r please read.

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If i trimmed the air inlet holes on my side panel to be a little bigger to let in more air flow, would that give me better throttle response? would there be bad thing about this?

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I don't think it helps that much if at all. I had an 03' and what helped it was a JD jet kit and a Boyesen Accelerator Pump cover. If you are looking for low end response you might wanna go up a couple of teeth on the rear sprocket or up one on the front sprocket. The pump cover and jet kit got rid of a little bog the bike had at lower speeds. Just my .02

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