I have read that anything longer than 6" begins to give jetting issues? However, the Yerf Dog has an intake tube of 8" before the air filter if I remember correctly.
In my experiment, I gained slighty better acceleration with the 8" tube over the 6", but lost .2 MPH on the top with it.
Maybe I should try a 7" just for kicks, and do a back to back to back test of them. Hmmm.....
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