40003 - Polished manifold long, 1 ring, for Kyosho car.		40004 - Polished manifold short, 1 ring, for Kyosho car.		41001 - Compact polished manifold, 2 rings.
41005 - Compact polished manifold, long, 2 rings.		41019 - Compact polished manifold extra short, 2 rings.		41020 - Polished manifold, long, 2 rings.
41021 - Polished manifolsd short, 2 rings.		41026 - Long curved manifold for N21B 2001BF/RT and N21B 2001BF/PS engine. Usable on left and right sided tuned pipes.
41029 - Polished manifold compact short, 2 rings  Ø16/13mm for Mugen buggy car.		41030 - Polished manifold compact long, 2 rings  Ø16/13mm for Mugen buggy car.		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. NEW 2014

 
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.