Following on from my last blog post - the cat gaskets started to blow after the track day. The physical cat started to came loose on track lol.
Turns out I had melted the gaskets on both ends of the cats. #hero. Both replaced and have resolved the blowy / loud exhaust noise
Also the source of the lump-ness down low has been diagnosed to a failing or failed TPS sensor(Throttle Position Sensor). It has also been replaced & tested by TDP and all found to be driving fine once again.
Am off to collect the car later on today so fingers crossed all ok!
As always, stay tuned....