A cammed LSx engine with headers/full exhaust sounds the best I think:
Best sounding racing is the Unlimited class at Reno Air Races:
NASCAR Sprint Cup is a close 2nd:
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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