I can shed some light on this as I've had the decat on my Emira since July and I've driven a UK spec Evora 410 on a number of occasions (the UK Evora had no 3rd cat from the factory). The decat does indeed make a BIG difference to the sound on the Emira, more than I was expecting. In Sport or Track at high revs it sounds absolutely feral. In the standard car the predominant noise at high revs is is the supercharger whine; with the decat the whine is drowned out by the exhaust howl. Honestly, you would have to be a deaf metal freak to want it any louder

. From memory, If anything I would say it is a tad louder than the Evora 410. Fortunately it remains pretty civilised when just cruising.