Thought it would be helpful if sports exhaust owners could update this wiki to help those trying to choose one from the myriad of options available. I've populated the table with a few systems I can think of, please add any I've missed and new lines for the same systems across different models:

Manufacturer	Exhaust Desc	Porsche Model	Cost	Desc of sound	Static Volume(dB) 0.5m @ 45 degs @ 3/4 max rpm	Sound file/video	Contributor
Roock
Dansk
Oettle	Bypass	996 C2	£400 Exchange modified genuine porsche mufflers	Deep rumble at idle, Audio bliss on rising throttle, Unobtrusive when cruising		Clips available on oettle website	Pugley
RSR
Fabspeed
Evoms
PSE	Switchable	996 C4S	£1900 discounted from £2300	Burbles at idle, howls through rev range, super bark at full bore, loud PSE			Callughan
Supersprint
DesignTek	Sports (as opposed to Super Sound)	996 C4S	£595+2.5hrs labour+£30 of nuts/bolts+VAT	Throatier/deeper at lower/medium revs, loud on an open throttle, comes alive at 3.7k rpm	95	to follow	Mario149
SCE
Remus
AWE	Extractors/200-Cell Cats/Silencers. Adds about 30BHP	997S (Systems also available for other Porsche models)	£3000+	997S - Bassier idle. Quiet at part throttle. Hard-edged howl at full throttle. GT3 - OMFG!		www.awe-tuning.com	Ian_UK1
Borla
AfterHours
Milltek
Europipe
Tubi
Cargraphic
B&B
Agency Power	Sports	997S	£520.00 plus 3hrs fitting	deeper burble lower down then barks further up the rev range		http://www.vividracing.com/catalog/exhaust-parts-mufflers-c-4246_5078.html	daggerpie
Manthey	sport	996 C2	£1570 fitted	Subtle at low revs-louder than stock, 'burble' on increase, bordering cup-ish at WOT	98.9	to follow	s_mcneil