The 2bular 4-1 manifold + the HJS HD catalyser combine to release some serious gains in power AND torque. A tricky task as the standard torque figures were very good to start with.
The factory manifold design is very poor for a supercharged install and the stepped 2bular 4-1 manifold is a vast improvement. Adding a catalyser is always problematical to achieving best power but the big HJS HD version ensures you can meet all emissions tests and still gain +32bhp. NO OTHER CATALYSER WILL DO THE SAME JOB AS EFFICIENTLY AS THE HJS HD DIRECTIONAL DESIGN.
https://www.rrrengineering.co.uk/ now offer their their stand-alone ECU for this install.
RECENT INDEPENDENT TESTING AGAINST OTHER 2ZR AFTERMARKET MANIFOLDS SHOWED THAT THE 2BULAR MANIFOLD GAVE BEST POWER AND TORQUE.
PLEASE NOTE: I DO NOT SUPPLY THE LAMBDA SENSOR ANY MORE - TOO MANY FAILURES.
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