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XFI RPM 206/212 Hydraulic Roller Cam for GM LS GEN III/IV; Very strong torque, good mileage. Noticeable increase over stock cam.

XFI RPM 212/218 Hydraulic Roller Cam for GM LS GEN III/IV; Good torque and very strong mid-range power. Good performance cam.

XFI RPM 216/220 Hydraulic Roller Cam for GM LS GEN III/IV; Great mid-range with superior top end power. Needs programmer.

Xtreme RPM 218/218 Hydraulic Roller Cams for Ford 4.6/5.4/5.8L Modular 4 Valve; Excellent replacement cam with strong torque. Requires custom tuning.

Xtreme RPM 226/222 Hydraulic Roller Cams for Ford 4.6/5.4/5.8L Modular 4 Valve; Great street performance featuring excellent torque and horsepower gains with a noticeable idle. Requires custom tuning.

Xtreme RPM 230/230 Hydraulic Roller Cams for Ford 4.6/5.4/5.8L Modular 4 Valve; Serious street effort with maximum power gains in mid to upper RPM. Requires computer modifications and lower gears. Automatic cars need a 2000+ stall. Requires custom tuning. Mild rough idle.

Xtreme RPM 234/230 Hydraulic Roller Cams for Ford 4.6/5.4/5.8L Modular 4 Valve; Street and strip performance. Needs lower gears, exhaust upgrades, larger throttle body and mass air, bigger fuel injectors and a 2200+ stall with automatics. Requires custom tuning. Rough idle.

Xtreme Energy 210/220 Hydraulic Roller Cam for GM LT1/LT4; Good in factory LT1, noticeable increase over stock cam.

Xtreme Energy 220/230 Hydraulic Roller Cam for GM LT1/LT4; For use in LT1, with custom tuning.

Xtreme Energy 230/244 Hydraulic Roller Cam for GM LT1/LT4; For use in LT1, with custom tuning, headers, gears, and 2200+ stall. Rough idle.

Xtreme Energy 218/224 Hydraulic Roller Cam for GM LT1/LT4; Good for performance LT1. Requires custom tuning and upgraded exhaust.

Xtreme Energy 224/230 Hydraulic Roller Cam for GM LT1/LT4; Best cam for modified LT1, better exhaust and 2000+ converter. Requires custom tuning.