Right now I'm using an A12 and I never get enough comments on how mine sounds, People think it's a v8 at idle and when I'm using my A14 they think it's a rotor! .I'm using a weber 32\36 dgv on the intake and an a14\15 exhaust manifold with a 1 3\4 inch pipe into a same size inlet outlet muffler for the rest of teh system. I used to dump it at the diff but that does get quite loud from the boot resonating the noise, now it's just goes over and out the back. Something I'm going to do with the A14's exhaust this time round is to go up to 2 inches and run a smaller diameter twin pipe from the muffer to the back to hopefully reduce some of the noise it makes. You could hear me coming from like 3 km away on a nice night!