A Thunder Alley exhaust will help with the bottom end.I can't find his website but here's some contact info.If you search this website Rich posted up about his stuff a few years ago.I have one on my CRF450R and it is great.Loud but does the trick.
Thunder Alley
1010 East Lacey Boulevard
Hanford, California 93230
(559) 584-8109
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