Since 2003, no other performance product has created more excitement for Cobra owners than the shrill billet whine of a Kenne Bell Twin Screw. Up to 289 more HP over stock (655-366=289HP). Our most popular Street Kits. Huge HP potential. Plenty of room to grow. Best $/HP value. Far more HP than porting Eaton, headers, heads, cams, x pipe. Big bad billet BIG BORE™ H Series uses less engine HP to drive than OEM Eaton (up to 85HP) and 56HP less than other Twin Screws (2.2, 2.3, 2.4L). That means more HP to the rear wheels. +70HP over Eaton at a mere 13 psi (+38 from parasitic loss only).

Also 30° cooler air charge temp than other Twin Screws. Boost won’t drop off or is limited to 13 psi. Range of 9-15 psi on the street and up to 24 psi for weekend competition with only pulley change. 655HP at 24 psi on a 100% stock engine (no headers, heads or cams) thru the cats with just a cat back and Kenne Bell Cool Air Kit.

Uses stock crank pulley. No oversize expensive crank pulley required for higher boost. And it fits under the stock hood. Only a Kenne Bell BOOST-A-PUMP™ is needed for 700HP. No larger pumps, lines, rails, injectors necessary. After 700HP, upgrade the fuel system.

INSTANT BOOST / &TORQUE at ANY rpm - 2500 up.
Direct bolt on replacement. Easily installed.
More power, cooler charge temp, less power consumption/parasitic loss than stock Eaton.
90% efficiency.
Approx. 13 psi gain per 1 psi boost.
30% less parasitic loss and 30% lower air charge temp at same HP.
+70HP gain at 13 psi (489 vs 417).
Best $ value bolt on. More power than headers, cam, throttle body, MAF meter, chip and filter COMBINED.
38HP at 13 psi just from reduced power consumption.
No "boost drop off" (stock Eaton is 13 psi @ 4000 and only 10.5 psi @ 6000).
No "boost lag" as with centrifugals and turbos.
Quick and easy 4 minute pulley/boost changes.
Boost range 9*- 26 psi.
Billet aluminum construction.
Whisper quiet.
Billet bypass valve.
Internally lubricated. No tapping holes in pan required.
Doesn't use engine oil.
Looks factory.
Available polished or black satin.
Stock "dual" or Kenne Bell "Big Oval" inlet manifolds available (optional).

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Up to 655 RWHP vs. stock 366HP with stock cats, MAF meter, throttle body and injectors from ONLY a Kenne Bell Supercharger Upgrade kit, Cobra Cool Air Kit and cat back.

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*2L Series
Largest Displacement - Most Powerful Billet Twin Screw Kits*
Tested By 5.0 Mustang & Super Fords and Muscle Mustangs & Fast Fords Magazine