Subaru FA20 Turbo Comprehensive Timing KitThe 100% Zero Compromise Overhaul for WRX, Levorg, and Forester XT. The FA20 turbo platform is a precision instrument, but it relies on a complex network of chains, guides, and hydraulic tensioners to maintain its rhythmic pulse. Over time, heat soak and high load cycles lead to chain stretch and guide fatigue the primary silent killers of the FA20. The Roo Racing Comprehensive Kit is curated for the "engine out" builder and the perfectionist owner.