2bular exhaust manifold with catalytic converter
All Stainless 304/316 construction. 10mm thick Stainless head flange with laser-cut expansion slots and zero distortion after welding. Stepped primaries - not too long/not too short. Longer than this design will cost you power! A quality hand-built/TIG-welded merged collector (not pressed tin!). Combined with the 121mm diameter HJS HD Directional 200Cell catalyser.
ONLY 2BULAR CAN OFFER YOU THIS QUALITY.
Independently tested against other aftermarket offerings, the 2bular 4-1 gave the best power AND torque.