ok this is a bit long winded but seeing as I've experience of various version discussed can add some personal experience.
At the moment on 3 of my cars I have:
Pitcrew centre exit dual exit exhaust: I'd qualify this as fairly quiet, nearest to comparison HKS silent exhaust system. Nice note, not too loud at idle, opens up well but discreetly like a HKS Silent WOT. I have this fitted with IRTBs and a silent de-cat pipe.
Pitcrew centre exit single exit exhaust: only just fitted to the car. This is very similar in noise and sound to the unknown JDM exhaust mentioned below.
Unknown JDM centre exit single exit exhaust on my red car (looks like exhaust on RS Active demo car). This exhaust is fitted to a standard 1.6 NA. Not too loud on idle, opens up WOT almost a motorbike sound from it.
Others I had:
Pole Position centre exit dual exit exhaust: bit big and bulky looking on a roadster. Noisier on idle the Pitcrew centre exit dual exit exhaust. I don't remember exhaust note but nothing to write home about.
Others I've heard:
St May Shotgun exhaust: like the Pole Position not my personal favourite look as ate bulky. Quite loud on idle compared to Pitcrew centre exit dual exit exhaust and definitely louder WOT compared to the Pitcrew centre exit dual exit exhaust.
None are as loud by any stretch to the RS*R Exmag I have on 2 of my other cars and likewise a lot quieter then the Corns exhausts I have had previously.
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