The RT4100HR seat features a lightweight fiberglass shell engineered for strength

V-band inlet: 92mm (GTX30/35 = 76mm)

Fast and consistent response times

Available in matched and balanced sets of 8

CNC Coolant Pipe / Hardware

BMW S14 400 Series NA Power Pack SUP-HPVK The RT4100HR seat features aThe 400 Series Power Pack is the one click forged internals kit for naturally aspirated BMW S14B23 engines, delivering modern performance for this legendary engine. Designed for enthusiasts aiming for 400HP, this kit is a major upgrade over aging OEM components, offering improved strength, durability, and reliability. Featuring Arias Forged Pistons (94mm bore, 11: 1 compression) and SP Components Connecting Rods, this kit is built for high revving,