Which cossie are we talking about? One that should have a cat as standard? Or an earlier type?

All software will pass the earlier 3.5 limit no problems, walk in teh park, but if the later 0.5 limit, even my closed loop software wont pass the test normally, although i can get the emissions to 0.3% up to 1000cc injectors, but not reliably, its normally more like 0.75%.

Bottom line, time to buy a sports cat.