Join Date: Jan 2014
Location: South Central PA
A sub $3000 SE tire shredder kit will give you 120/120ish from 110 inches depending on your pipes and tuner. You can install it at home, with the lower end in the scooter. But you'll need a good wheel set. If it needs wheels and a plate and pump, now your getting close to crate motor money. Your there if you are paying the wrench. And smart money says all 103's need new wheel sets, sooner or later, later just costs more.
A kit 110 will make more power than a S&S 111 using the oem takeoffs. Same with the SE124. The S&S 124 will make about the same as the 110 SE-TS kit using the oem take offs. All of the crate motors will benefit from larger the throttle bodies and injectors like come with the SE-TS kit.
So its 6 of one and half a dozen of the other. If you do your own work, the 110 kit is cheaper horse power. if you pay the wrench, then the S&S motors are prolly the way to go. The SE 120 is the least expensive crate motor, both for the motor and for the install, but I'm not going to recommend that motor to anyone.
Be aware, that past 120/120 you'll start paying driveline tax. The comps aren't up to living with 75/75. The clutch isn't really up to the task of holding 120 hp, and little things like replacing the rear axle adjuster cams costs an arm and a leg.
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