check out this thread...
I haven't actually tried it yet, but I will, because it probably can't hurt it at the worse, and you might get a little more at the best. Probably not enought to feel on the SOP (seat of pants)Dyno.
I did remove the Kleen system on my 01 when I was installing my jet kit and I noticed a little better performance, it also idled and ran much smoother. Its a piece of cake to take out, the only thing you will need is just some vacuum line caps or plugs.
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