There is a distressingly lazy tendency at the moment for some manufacturers to offer the same design of header for the Normally Aspirated (n/a) motor and the Supercharger! With over 100bhp difference between them, how can one design do for both?

Without a doubt, it takes a lot of R&D to find a header design on the 2zz-ge n/a motor which gives more power without destroying the torque. My 4-2-1 design is the only header I’ve seen which offers good power increases and good improvements in torque. You need a stepped primary and big bore secondaries – I haven’t seen those on another header on sale at the moment. The Supercharger install demands a 4-1 header with diameter of 1 7/8” (48mm) on the primaries – anything smaller will cost you power!

The 1zz-fe motor in the Elise S is an amazingly good engine. I think I’m the only manufacturer offering a header for it at the moment. It requires different bores from the 2zz-ge and with good torque figures, doesn’t need the stepped primaries.