Add to Cart Thomas Bus Aluminized 4" x 48" Straight Stack and Exhaust Pipe Kit GrandRock MSRP: Now: $384.95 Was: Thomas Bus Aluminized 4" x 48" Straight Stack and Exhaust Pipe Kit This aftermarket exhaust kit is designed to seamlessly integrate into your exhaust system. Heavy Duty Exhaust Pipe & Straight Stack Kit Fits Thomas Bus EFX Front Engine... MSRP: Now: $384.95 Was: Add to Cart