By conducting searches, listening to sound clips and asking people, I get the general impression that, in increasing order of exhaust system peak loudness, we have something like this:

(1) OEM
(2) MazdaSpeed
(3) Borla
(4) Racing Beat
(5) Greddy
(6) HKS

I don't know where the RX-8 store exhaust or others fit in, nor do I know if my list is accurate. But it's a start. If you have additions or corrections, please cut and paste this list in your reply, and edit it as necessary.

Some people say the Borla is louder than Racing Beat, but the people at MazdaTrix, who sell both systems, told me it's the other way around. Another vendor agreed with them.

 

Do you have an HKS sound clip???

 

i have ordered the greddy but just got out cause backorder
is a nightmare when you want something as bad as a exhaust.
r/b is available at mazdatrix-in stock ?
btw i have heard the greddy on 8 at acosta motorsports and it sounded very nice.

 

err my magnaflows are probably between the borla and mazdaspeed .... errr they were custom built , but the weird thing is ... they look exactly like the ones on the magnaflow thread ... same tips and everything .... 8/ weird huh ?

 

err listenin to the rest of the exhausts , my exhaust sounds nothing like any of them ... well I havn';t heard the mazdaspeed one tho , but my exhaust doesnt' sound raspy like he borla , or loud. It's a really low ferrari like revving.

 

Anybody have any idea which one is recommended with the hi-flow cat/resonator setup from Can Zoomer ? I hear that with the Borla it is too loud, so with the Greddy or RB it would be even louder ?

 

jeup, does the greddy exhaust really sound as loud as 350z with full exhaust? the Z's tone is very deep even stock.

 

ive heard the sound reals for the bb and i just put a tanabe catback on today. i think its a pretty deep sound but still kinda loud when you let off the throttle, i would say its right under the hks if not as loud