What are yours?

mine are:
4cyl - tie, wrx and neon srt-4
6cyl - infiniti g35/nissan skyline
8cyl - ferrari 360 modena and '03-'04 cobra
10cyl - cummins turbo diesel
12cyl - ferrari 575M (followed one for like 20 minutes last weekend just because it sounded insane...)

1999 Pontiac Firehawk...stock from SLP!

Favorite sounding motorcycle: Harley Davidson. I just love the way they sound!!!

Regal Grand National
any 3800 Series II NA with the dual exhaust and 3800 Series II L67 with the air conditioner on

any 3100 3400 from 95 on up with the ac on

and without. when you turn the ac on the air conditioner make a noise and blends in with the engine sound. sound like a whole different car!

Detrit Diesel motors when idleing
Catapilliar motors in Peterbuilts
Jake Brakes with the pipes wide open
Metra commuter Trains and freight trains

2005 Pontiac Bonneville GXP....oh man that thing sound nice when he took off w/o wide open throttle.

Some of our CTA buses here in the city.

CAMMED VEHICLES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Yes!! Got that right. I love that "potata, potata, potata" sound! Very aggresive sounding.

I can't make up my mind about the best sounding car but i've always thought jake brakes sound cool as hell.

Bonneville GXP
3800 w/Dual Exhaust
7.3L Powerstroke Ford
Chevy 454
Pontiac 455
Ford 4.6L DOHC Mach 1
Vortec 8100
6.6L Duramax
Acura Interga Type-R w/Greddy Evo Exhaust (ooo I know its an import but it sounds great)

Fat Boy with aftermarket pipes and muffler removed

... just about any inline-six

... just about any "boxer" motor (read: Subaru, Porsche)

... the Lexus 1UZ-FE 4.0L V8.

agreed, just thought the wrx was the simplest way of illustrating it