The Pro-Flo XT LS3 EFI intake manifold is engineered with a large plenum and 6 25" tapered runners to deliver maximum horsepower and a broad torque band from 1500-7000+ rpm It features a 90mm throttle bore opening that can be ported to 105mm as needed Machined for use with a stock LS3 style MAP sensor or Edelbrock #36019 that is mounted directly to the manifold The Pro-Flo XT LS3 EFI accepts GM OEM 90mm or Edelbrock #3869/#38693 throttle bodies Compatible with LS3 Fuel Rail Kit #3648 (sold separately) which features -8 AN inlet and outlet Not intended as direct replacement for late-model vehicles due to hood and cowl clearance In testing the Pro-Flo XT LS3 intake manifold made 16 horsepower more and the peak power point also increased by 500 rpm compared to a competitors plastic design The Pro-Flo XT LS3 intake manifold is the best choice for your boosted or nitrous powered LS3 engine Throttle Body Recommendations Edelbrock #3869/#38693 or OEM drive-by-wire style Installation Notes Uses LS3/ L92/L76 style individual port O-ring seals GM PN19256623 or Edelbrock #7395 Manifold Dimensions A-9 28" B-9 68" C-17 40" D-3 02" E-15° Port exit dimensions 1 23" x 2 52"