Project 2.

[Brett027]

In practice a small increase from 2 inch to 2.25 inch, but that small diameter change increases the flow (in theory) by about 26%. Combined with the better design of the pipe layout (particularly between the extractors and the muffler) and importantly, the uniform pipe size through the bends, the overall change makes a substantial difference. Where the bends were before cut the diameter and therefore the flow considerably. The difference is noticeable.