For GT class
41019 - Polished manifold extra short, 2 rings.		41031 - Polished conical short header set 2 rings Ø18/15mm. NEW 2014		41032 - Polished Conical Header Set 2Rings Ø18/15mm. NEW 2014
41033 - Polished Curved Header Set 2Rings Ø16/13mm, -3 mm shorter than 41021. NOVITA' 2014

For RALLY class
41015 - Polished manifold conical short, 2 rings 5 fins.		41016 - Polished manifold conical medium, 2 rings 6 fins.		41017 - polished manifold conical long, 2 rings 7 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.