Long-length exhaust manifold

Boosts up engine performance by 10 to 15 hp, greatly benefits LOW RPM ranges. For those who seek a very responsive tune.
By the use of a high union chamber between the 4 tubes, fluid dynamics are improved, which resulted in better response at lower rpm.

This manifold doesn’t need any modification to be installed in place of the original one.
All internal welding is smoothed to improve exhaust gas flow.