I have a stock 99. I purchased a hole shot 4-1. After a dyno tune I went from 110hp
to 121. Each bike is different but from the factory mine was running way to lean.
When I would roll out of the gas. He would put up a popping fit. After the dyno tune
he calmed down. You are going to lose low range power. He is a dog from idle to
3,000 rpms, but after that he barks to life!! It is almost like having two "V"
stages. To get the full bennies of the 4-1, some recomend drilling a couple of 1/2"
hloes in the air filter cover. See what the guys say on the list.
Kraig
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