Emissions for MOT

[Topcats Monaro]

Hello all, I have a 2005 supercharged LS2 Monaro. I have had the proper cats fitted after it blew out the old sports cats and it will only pass the mot on tickover. As soon as it gets to the required 2.500 revs it still fails, although i have a good mot'er i would like to get it fixed.
Do any of you know of a good tuner around the Hertfordshire or surrounding areas. Don't mind a day out if someone can reduce the fuel going in as it seems to be the cause.

Thanks in anticipation

Terry.

[Lincsls1]

Have you checked the pre cat O2 sensors are operating correctly?
Regarding tuners, I think you're going to be travelling a bit further for that.
Maybe Carl Herkes of LS Performance Parts? Sure I've read he can map these and is very good. Worth a call?

https://lsperformanceparts.com/

[Topcats Monaro]

Hi, yes I have fitted new ones. Will try LS Performance and don't mind travelling as it gives the old girl a good run.
Thanks for the reply.