The stock header is the most restrictive part of the exhaust on the K20A engine. We have been spending years of effort to develop a header with longer 4-2 conjunction to optimize torque and hp across the power band. Finally we have come up with a 45mm piping size for primaries with 60mm pipe for collector. The 4-2-1 design is to improve exhaust efficiency other than increasing volume. All exhaust tubing are 1.2mm thick to reduce as much weight as possible while maintaining a strong enough structural design to with hold the heat and stress caused by the engine. The header replaces the stock 4-1 portion and the stock catalytic converter. This header was developed and intended for race and track use only.

Header Specs:
-304 Stainless Brushed Steel
-2.5 in collector
-Hand Tig Welded
-1 Year Warranty against breaking/cracking
- Includes: new gaskets & hardware. O2 simulator so no CEL.