GSC Power-Division Single Valve Spring and Titanium Retainer Kit for Subaru EJ Ej Timing Parts 5i long-runner intake manifolds with

5i long-runner intake manifolds with no additional adapters

This closed deck block design has been proven to withstand extreme boost levels resulting in high cylinder pressures without the worry of cracking a sleeve

it also triggers the bore/honing of the mains so you would kill two birds with one stone

Significantly increase strength over the OEM *and* our former billet unit

Ceramic Crown Coating

GSC Power-Division Single Valve Spring and Titanium Retainer Kit for Subaru EJ Ej Timing Parts 5i long-runner intake manifolds with5743 Single Spring Pressure @ spring height 75lbs @ 1. 333" 195lbs @ . 919" Max Boost: 32 PSI Max RPM: 8200 (using an S1 or S2 profile cam)