After testing 2 manifold designs in conjunction with our experience on both fully built and street based turbo motors, this is the manifold/ plenum combination that gave the best combined results for both drifting and drag racing. The runner length is optimized to eliminate the high RPM spikes of other manifolds without sacrificing overall flow for more average power gains across the charts.
Xcessive Manufacturing's intake manifold for the SR20DET-S13 motor (S13-S14 chassis) is designed to take advantage of the factory high port/runner design and dramatically increase flow for boosted motors. The slightly longer runners allow for a better power band from mid range to high rpm instead of the short runner drag race design common on other intakes good only for peak output at the top of the power band. With a smooth radius on the entry and angle cut runners, a velocity stack effect is achieved without having stacks protruding into plenum airflow and causing turbulence. The new plenum is permanent mold cast for superior finish and casting soundness with a phenolic shell core used for internal walls to yield some of the best quality available. The plenum is drilled for the factory throttle body and bolt pattern but comes pre machined for up to a 70 mm bore (Up to 80 mm bore available and custom bolt patterns as special order, call prior to ordering.) The two piece runner/plenum design also allows for easier porting and polishing of the intake.
The manifold kit includes the welded flange on the factory runners, new Xcessive plenum with 4 vacuum ports, new stainless throttle bracket, 6 plenum bolts, 4 studs, 4 nuts, two vacuum fittings (1/8", 3/8") and two vacuum port plugs. Factory throttle body not included.
An $80.00 core charge is applied for the runners. It will be refunded upon Xcessive's receipt of your old runner set. The $80 is applied in the shipping calculation and will be refunded via mail. If you have a set of runners you would like to have used (ie. polished, coated), please contact us prior to ordering.
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