40203 - Polished manifold, 1 ring, with increased diameter.		41204 - polished manifold, short, 2 rings with increased diameter.		41201 - Sanded manifold set, 2 Rings Ø13/16.

All manifold kits include gasket exhaust and springs.

Shorter exhaust: gives less acceleration, but an increased topspeed.

Longer exhaust: gives more acceleration, but reduced top speed.

Conical exhaust: top speed higher, higher acceleration and higher fuel consumption.

Cylindrical exhaust: top speed lower and lower fuel consumption.