2ZZ-GE 4-2-1 Manifold & Test-pipe.
The N/A 2ZZ-GE is a typical Yamaha design, rev-happy but short on torque. Even Lotus recognise this and use a 4-2-1 layout with a split secondary pipe (bi-furcated for the technically minded). Unfortunately, the main header/manifold is too short and too small a diameter to make best use of that feature.
This 2bular 4-2-1 manifold has a stepped-primary design - port-matched at the cylinder head and stepped up to 45mm to handle the gas-flow at the upper end of the rev range. Equal length primaries matched to equal length secondaries mean the best power and torque is achieved.
The Test-Pipe is 60mm diameter to retain all the torque and only steps up to 63.5mm at the final bend into the system. This whole design is specifically developed for the N/A 2ZZ-GE motor and is unique in its design elements.
Very high-quality - TIG-welded - all-stainless construction, using merged 2-1 collectors for best gas-flow control. I see so many manifolds with pressed tin collectors these days - very poor. Or the same manifold offered for the N/A motor AND the supercharged install - how does that work?! Sad.
SUPPLIED WITH ALL GASKETS/FITTING KITS.