There are two catalyser installs on the Toyota-engined Elises which destroy their factory catalysers more than the other motors. One is the 2ZZ Elise SC model. The other is this one - the 2ZR motor!
The factory 2ZR manifold has a different 2-bolt flange compared to the 2ZZ and a different bore downpipe to the catalyser. This downpipe is 60mm diameter. Any larger and you're damaging torque.
I use the highest spec Euro 5/6 121mm diameter HJS HD directional catalyser on these installs. No problems with emissions tests and you will not have a CEL.
Only 2bular designs and builds an HJS HD catalyser to fit to the factory manifold.
PLEASE NOTE: I DO NOT SUPPLY THE LAMBDA SENSOR ANY MORE - TOO MANY FAILURES.
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