The Pro-Flo XT LS3 EFI intake manifold is engineered with a large plenum and 6.25in tapered runners to deliver maximum horsepower and a broad torque band from 1500-7000plus 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 No.36019 that is mounted directly to the manifold. The Pro-Flo XT LS3 EFI accepts GM OEM 90mm or Edelbrock No.3869/No.38693 throttle bodies. Compatible with LS3 Fuel Rail Kit No.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 No.3869/No.38693 or OEM drive-by-wire style. Installation Notes: Uses LS3/ L92/L76 style individual port o-ring seals GM PN19256623 or Edelbrock No.7395. Manifold Dimensions: A-9.28in, B-9.68in, C-17.40in, D-3.02in, E-15. Port exit dimensions: 1.23Gg x 2.52Gg.