zx14durham
Expert Class
4n21
Posts: 142
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posted October 26, 2007 03:37 PM
U4.2 or MR9 for stock motor ZX14
Which gas is working better, What was you horsepower gain.
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thutch26

Expert Class
thutch26
Posts: 483
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posted October 27, 2007 02:53 AM
i've never tried the u4 but the mr9 makes the bike run like a 30 shot of constant nos!!!!! atlease it did mine anyway!!!
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Gettin faster everytime I go to the track!!!
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madkawboy

Expert Class
Posts: 398
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posted October 27, 2007 04:17 AM
i dynoed mine last week with MR9 and picked up 7 hp. Never tried the 4.2 but i have always heard the MR9 was the best. MR9 is a lot more $$
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2007 ZX-14
Stock Wheel Base, footshifting, pump gas
5.94 @ 128 mph
1.50 60ft
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