After trying out several options, I wound up preferring a non-exotic non-valved AWE Track Exhaust with stock OEM downpipes. To each their own but for me its the perfect combination of sound quality and volume as well as balance of engine vs muffler/tailpipe volume. I know you're looking for valved but with the AWE I found all you have to do is drive around in auto-D mode and its very quiet but auto-S mode opens it up nicely while trawling around at 5k rpm in Manual mode is the best. Just saying you may not need to spend $4k - and ofc if you need obscene levels of volume, you can always throw on the non-res DPs and still be under $2k...not to mention the guys at Xpel who drive true exotics every day in and out of their garage bays have all said my car sounds amazing and like a supercar - which is high praise coming from them.