SCREAMIN’ EA­GLE M-8 HOP-UP

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The three most com­mon en­gine up­grades for an Amer­i­can V-twin are—hands down—high-flow air cleaner, a high-flow ex­haust, and for the most power gains, a cam swap. Well this is ex­actly what we did with the 2018 Har­ley-david­son Softail Street Bob equipped with the 107 Mil­wau­kee-eight en­gine. We used all parts from Screamin’ Ea­gle and racked up a to­tal bill of ap­prox­i­mately $1,450, in­clud­ing a tuner to re­flash the ECU. If you are look­ing for a nice bump in power with min­i­mal ef­fort, this would be a great setup for you. If you de­sire a lit­tle more, bump­ing up the dis­place­ment would be your next move. Run­ning this setup, we went from 73.9 hp and 104.8 foot-pounds of torque to 92.4 hp and 106.3 foot-pounds of torque.

SCREAMIN’ EA­GLE MIL­WAU­KEE-EIGHT STAGE II TORQUE KIT

The Stage II Torque kit from Screamin’ Ea­gle will cost you $399.95 and comes with all nec­es­sary O-rings and gas­kets for the job, which aren’t many. It also comes with, of course, the new cam, as well as a set of ad­justable pushrods, new pushrod tubes, and keep­ers. The ben­e­fit to this kit with the ad­justable pushrods is that they al­low you to keep the rocker boxes in­tact, sav­ing you time and money. This is pos­si­ble by sim­ply cut­ting out the old pushrods us­ing a pair of bolt cut­ters. An­other pos­i­tive about this kit is that it re­tains its orig­i­nal-equip­ment fac­tory war­ranty.

SCREAMIN’ EA­GLE STREET CAN­NON MUF­FLERS, LONG

The new set of muf­flers known as the Street Can­non slip-ons from Screamin’ Ea­gle will run you $549.95 from the dealer. The deci­bel rat­ing is still within the le­gal limit, and these are all 50-state U.S. EPA com­pli­ant, so you won’t need to worry about ever get­ting a ticket be­cause of your ex­haust sys­tem. With a large 3.5-inch di­am­e­ter, the Street Can­non muf­flers of­fer a nice path for the ex­haust gases to flow with­out com­pro­mis­ing back pres­sure.

SCREAMIN’ EA­GLE EX­TREME-FLOW AIR CLEANER; ROUND, CEN­TER BOLT

Air clean­ers are a dime a dozen; every­one makes a hand­ful. There are some stinkers out there, but most are go­ing to do the in­tended job just fine. This es­sen­tially lim­its your de­ci­sion to aes­thetic. With the Ex­treme-flow air cleaner, you get more of a naked, raw-power vibe. With no fancy cover, all you see is that fil­ter. For the di­rec­tion we went with the Street Bob, it fits per­fectly. The Ex­treme-flow from Screamin’ Ea­gle will cost you $199.95 from Har­ley-david­son. The air cleaner is 50-state U.S. EPA com­pli­ant, and the kit in­cludes all hard­ware needed for the in­stal­la­tion.

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