Still waiting for some dry roads, but I thought this was an interesting comparison:
Engine 1: DZ302, 11:1 compression, 170cc heads, 248/
[email protected] solid flat tappet, 1 3/4 headers, 2.5" exhaust with h-pipe, Flowmaster 80 series cross-flow muffler.
https://youtu.be/G99ba3B7sWs
Engine 2: DZ372, 14:1 compression, 218cc heads, 268/
[email protected] solid roller, 1 3/4 headers, 3" exhaust with x-pipe, SpinTech mufflers.
https://youtu.be/z1JLqpJwVyE
The new motor is definitely louder in real life, but to me they sound nearly the same even though every single part from carb to tailpipe has been changed.