STM ARP Black Turbo to Manifold Bolt Kit for Evo 4-9 FP Cast Manifold Pressure Gauge increasing the cross section of

increasing the cross section of the intake and allowing the MAF sensor to read lower for the same amount of ingested air

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Dyno testing also yielded results of up to 70 whp with a tune and 2015 WRX intake with 93 octane fuel while maintaining safe AFRs

STM ARP Black Turbo to Manifold Bolt Kit for Evo 4-9 FP Cast Manifold Pressure Gauge increasing the cross section ofThis chromoly black oxide ARP bolt kit is for the Evo 4 9 with a FP cast manifold to replace the bolts and washers that secure your manifold to the turbo. Includes a set of four black ARP bolts with washers. We definitely suggest a touch of anti seize on your bolt threads before install. May Require Grinding Read Before Purchase! When we initially test fit these ARP bolts on the FP cast manifold, they fit perfect, no issues whatsoever. The more kits