Automobiliac's top 10 racing engine sounds

For no reason, I decided to list my top 10 favorite racing engines.  These are my personal favorites. Please feel free to share your own in the comment thread!

1) Matra V-12: Sounds like the wrath of the gods.

2) Aston Martin Straight Six: Smooth, with a wonderful guttural undertone.

3) Alfa Romeo Jano Supercharged Inline 8: The closest man has come to making a machine that sounds like a living, breathing thing.

4) The Colombo Ferrari V12: Needs no introduction

 5) Mercedes V-12: Defined the era.

6) BRM V-16: Ill fated car, sounds like raw aggression.

7) Offenhauser Indy Roadsters: Spine-tingling and brutal.

8) Can Am V8s, Ford and Chevy: Iron fist of America, hell yeah.

9) Group B Rally cars: Hard to pick a favorite, but the Audi Inline 5 Turbo is probably the most unique and memorable.

10) Ferrari 412 F1: The last of the V-12 Ferrari F1 engines.