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RCM V5/6 uprated valve springs, offering an increased spring rate over the standard Subaru spring to help reduce valve bounce at high revs. Unfitted length 43.5mm, coil diameter 3.8mm, approx. 40g each. Fits Subaru Impreza (GC/GF), V5/6.

RCM titanium valve spring retainers, supplied as a set of 16. For use with RCM double valve springs and later-style buckets with integrated shims. Please confirm compatibility with your engine before ordering.

RCM nitrided steel spring seat spacers for V3/4 cylinder heads, for use only with the RCM double valve spring kit (RCM906). Please confirm compatibility with your specific engine setup before ordering.

RCM nitrided steel spring seat spacers for V5+ cylinder heads. Please confirm compatibility with your specific engine and valve spring setup before ordering.

Injector adaptor kit allowing later Version 5–6 injectors to be fitted into earlier V1–V4 side feed fuel rails, for Subaru Impreza GC/GF (1992–2000). Injectors not included.

RCM Powerparts performance camshaft kit for dual-AVCS Subaru STI V10 applications, covering Impreza/WRX STI (GR/GV) and WRX STI (VA/VAB) models. Please contact Scooby Upgrades for full specification and kit contents, and to confirm fitment, before ordering.

Throttle wedge designed for reverse-facing manifold conversions on DBW V7+ manifolds. Welds directly onto the manifold to angle the throttle body forward instead of upward.

RCM Black Series dual-port angled thermostatic oil sandwich plate, with oil lines directable at multiple angles to suit twin-scroll, equal- and unequal-length exhaust manifolds. Integral thermostat opens at 85 degC. Supplied with 2x Dash 8 fittings.

Fitting kit for a complete 4-part 2.5″ exhaust system on Euro-spec ‘New Age’ Impreza models. Comprises genuine Subaru gaskets and high-tensile fasteners. Please contact Scooby Upgrades to confirm compatibility with your vehicle before ordering.

Fitting kit for installing a complete 2.5″ exhaust system on a Japanese-spec Impreza (not twin scroll). Comprises genuine Subaru gaskets and high-tensile fasteners for the installation.