The Novarossi 41016 is a Polished manifold Conical medium, 2 rings 6 fins.
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.