You seem to of covered most :
MillTek
Revolution
RCM
GRD
Hayward & Scott
Milltek may be too quite if you have a resonated centre or resonated downpipe. But not sure what they are like without.
Revolution is also quite quiet
GRD is what I have and fits well, supposed to be 98dB....u followed me through Lewes Tunnel, so you can decide how accurate that is !!!!!
Hayward & Scott has various tailpipe options, so you can probably 'tune' the levels to what you want. And knowing them could probably do that with them if fitted there.
All work out about £550 - £700 from turbo to tailpipe.
The downside is none will accept a standard cat pipe to be fitted for MOT.
I've been talking to LongLife Exhausts over in Ashford and they reckon you would need to weld in 2 cats in parrallel in a 3" bore system to be sure a 350-400BHP car would get through an MOT and not have performance stangled by a cat.
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