Stock vs 123 Wheel HP (All-Motor) Dyno Graph

[richardholdener]

Th header you have is a replacement for the stock header-it (like the stock exhaust manifold) is too short to provide any scavenging effect. It is the scavenging effect that improves power, not simply additional flow.Basically the header must be tuned for the application. It can either fit in place of the stock exhaust manifodl or be tuned to improve the power-but not both. The long-tube header does require a different mid pipe which will be sold with the header.

Originally Posted by whooppee777

i'm confused. this will replace the mid pipe as well? would there really be a difference in power between this and say...the weapon R header that i have?