+1 on the BMW E92 M3 with the glorious S65 V8. Mine came with a loud aftermarket exhaust and sounded fantastic, but I knew I'd grow to hate it over time, so I found a stock muffler (which has a shape designed for aero benefits) and installed that. Although it is a tad on the quiet side as Mystic Llama notes, it still makes an incredible growl as it shreds to 8750rpm. At idle, it just purrs, but from behind it sounds like a Cigarette boat. It's also freakin gorgeous. Those glowing headers are the actual stainless mandrel-bent pieces on the car. Compare with the cheesy hydroformed tubes that were on my Caymans. Though you can barely see them on the engine while it's in the car, it's nice to know they are there.
I'm planning a 1940 Ford hotrod build, and fantasize about putting an S65 in it.
