Designed for GM LS Gen III/IV cathedral port engines, Holley's new Modular Lo-Ram intakes are perfect for turbocharged and centrifugally supercharged combinations with tight hood clearances. With a peak power limit of 7000-8000 rpm, this ultra-low design is perfect for that new mighty mouse motor you've been dreaming of! These intake manifolds will work with OE or aftermarket cylinder heads and a 105 mm throttle body such as part # 112-581. The fuel rail kits come with two sets of brackets; A set for long (usually standard length) fuel injectors and a set for short (such as Pico, or LS7) fuel injectors.