Exhaust Manifold for Volvo 850 (1992-1997) 2.4L I5 EngineHigh Flow Exhaust Manifold for 1992 1997 Volvo 850 (2. 4L B5254 P80) What it Does: Replaces the restrictive cast iron factory manifold to reduce exhaust backpressure, lowering exhaust gas temperatures and improving cylinder scavenging. The Stock 850 Exhaust Restriction The factory Volvo P80 cast iron exhaust manifold was engineered for mass production and cost reduction rather than optimal exhaust gas velocity. The heavy cast iron is prone to heat