M54 De-compression Plate - Hopwood motorsports
Hopwood motorsports decompression plate kit.
Two head gaskets and a decompression plate to suit. Each kit comes with the ability to use the parts with M10 or M12 studs and will reduce your engine’s compression from around 10.5:1 to 8.5:1 making it suitable for even very high-powered builds (>500hp).
Kit works with M52TU and M54 engines only