991 GT2RS F1-SP Exhaust SystemPorsche 991 GT2RS F1 SP Exhaust System Cen Cal Motorsport Full Spool. Zero Restriction. Pure Turbo Violence. The Porsche 991 GT2RS is already one of the most insane cars ever built but the factory exhaust still holds it back. The Cen Cal Motorsport 991 GT2RS F1 SP Exhaust System is engineered with one goal in mind: maximum turbo spool, zero restriction, and an unapologetically aggressive F1 sound. This system is built around a full high flow spool