RE buying direct from Pacemaker, I asked that question early on, you have to go through one of the people that they supply (however you might be able to order direct from them if you have an ABN though, its worth a shot, the worst they will say is no). If you can get genies cheap do it, like I said there's ****all difference on the street, if your running a full on competition motor ie a commodore cup spec 253 then I'd be more selective i guess. Pacemaker told me to stick with the smaller primaries esp for a 253 but also for a 308 as you'll lose some low down torque with the big primaries but gain some top end, depends what youre trying to achieve.
Ive had both HM and paceys on my 308, the extractors themselves dont have much difference in sound, its the rest of the exhaust is where they can give your car a certain note.
