Still a lot of power but Jamie at FM has built many M8's that get easily in the 140's Hp/Tq with the stock crank and he claims they are holding together just fine. For even more torque and power with your stock cylinders, let us bore them all the way to 3.938", which gives either 98 or 107ci depending on the year of your bike. Based on what a SE 117" kit puts out with the Street Tuner, and within EPA guidelines, I would guess that the 131" kit wouldn't make more than maybe 122Hp/135Tq at best. The Revolution Performance 131" Twin Cam Monster Big Bore Kit is the key component to build a devastating 131" Twin Cam engine. This motor has a 4.310 bore on a 5.180 stroke for a total displacement of a whopping 151.14 cubic inches. This performance kit increases your Harley-Davidson M8 engine’s torque and horsepower by over 60 percent. TRASK Turbo Kits will boost the power on your Harley Davidson motorcycle at least 40-50 horsepower to the rear wheel! 2018 FLHRS FM 143″ 200 HP 2017 FLHX FM 124″ Kit WM8-408 Level A heads Jackpot XXX Rinehart mufflers 2019 FLHR FM 124″ Kit WM8-408 Level A heads Jackpot XXX Outlaw mufflers 2018 FLTRU FM 124″ Kit WM8-408 Level A heads Jackpot XXX Hi Roller mufflers 131 Stage IV Timer cover; If you buy the Kit with a new motorcycle, Harley-Davidson warrantees it for 24 months when the dealer installs it. January 26, 2017 By Ryan Urlacher Leave a Comment Leave other riders in the dust with the biggest, most powerful street-compliant crate performance engine Harley-Davidson has ever created. Our turbo systems make peak HP and TQ right where you need it, between 3,000 and 4,000 RPM. On a Softail over 60 days old, the warranty runs 12 months. Coupled with the kit's high-lift SE8-517 cam, high compression pistons and a 64 mm throttle body and intake manifold, this combination delivers a thrilling 131 ft-lb of torque and 121 HP rear-wheel output when paired with Built from the bottom up in Milwaukee, this street-tuned 131-cubic-inch Screamin’ Eagle Crate Engine is designed to run with a wide open throttle at high engine speeds and provide instant passing power from cruising speed. Bolt-On Big Bore Kits - Only $530! These kits include, 4.185 bore Mahle pistons and 4.185 precision bored cylinders, TTS 200 cam, high lift B-hive valve springs, high performance lifters, upgraded inner cam bearing, 5.5 gram injectors, Cometic head and base gaskets, as well as all … LAB-131-Should You Get a Vance & Hines 30+ Horsepower Kit For Your Harley Touring Model? It The Screamin’ Eagle 131 is a bolt-in replacement engine for select 2018-later model Harley-Davidson Softail motorcycles originally equipped with a Milwaukee-Eight engine, designed to run at high RPM and to provide a significant boost of torque from cruising speed. This is roughly an additional 3% on top of the standard overbore conversion described below. As you’d expect, the displacement increase also amps up both horsepower … S&S Cycle just introduced its new 131 cubic inch stroker kit, suitable for all your M8 power-enhancing needs. 98ci for 1999-2006 Models, 107ci for 2007-Present Models. The 151ci Kit from Leading Edge V-Twin is unlike anything the custom motorcycle industry has seen before. Our most popular Twin Cam kits! Suburban Speeds 120 and 124 kits for the 2017 and up Milwaukee Eight engines offer the ultimate in horsepower and torque. 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