I've noticed some mid and top-end gain. Two brothers said that all their pipes for the '03 add about 3hp gain to the bike. The bike now starts out at a rumble with an absolute scream that would scare the stock canister off of the bike. The high rpm scream is louder than the ram-air now, and has the classic pops when downshifting that you hear on the race track. That is the x-metal and the sun combining to get that look. The canister doesn't get hot until about 25 minutes of riding and looks gold in the sun.
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