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I really like mine, love the way they sound and how the pull all the way thru the revs, I havent had alot of nice weather to put alot of miles on to see what happened to my mileage, but i ride with guys with 5 gallon tanks, so it will be ok...guessing the mileage will be down a bit at first until I get used to the new power and quit playin!
I have the 555's, got them before the 777's came out. They wake that 103" right up! You might want to talk to Jamie and see which he recommends if you aren't going to do any other engine mods. I haven't heard any bad on either one adn they are very close, don't think you could go wrong either way. Then, when you add the 107" build ........................ Yee-hah!
i havent had a chance to hear a set, it it a big differance from stock?
I've got the 555's just a bit less lift and duration than the 777's, but mine are radically different than stock, the extra lift and duration can only make them sound yet a bit tougher. And the torque!
I'd like to try it out but it sure rises quick & drops off fast.
I'd rather have a much flatter torque curve. I make 20 more ftlbs down low and my torque stays stronger longer and I'm using 555's while only giving up 1hp/3tq peak to the above chart.
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