I think the prices will be equivalent or damn near it between the kits. Stillen cast a manifold Gtm cast the intake tube and modified the compressor housing on the blower. The Rotrex is a more expensive blower than the vortech, but stillen's tuning method an sensor placement will cost more. fuel system modifications we don't know about but they will probably be the same. Gtm has a lot more bracketry than stillen and moves around most of the front side of the motor.
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