28-01-2014, 06:54 PM
(28-01-2014, 01:46 PM)simonh Wrote: If you weld in the two cheap cats one after the other you'll have a pretty decent chance of a pass. The closer you can get them to the engine the better so they heat up faster. Combine it with a decent fuel treatment and new plugs and it should be almost guaranteed!
Two cats are the way forwards.