Most fans of Harley-Davidson know their trademark sound: potato potato potato
Except in the movie Avengers: Age of Ultron the Harley Davidson used was electric, called LiveWire. It sounds like a jet engine starting up.

Parts of the movie were filmed in Seoul, South Korea. Here’s a scene with Black Widow riding LiveWire.
That’s not smoke from the exhaust (it’s electric), that’s rubber burning:

For sale are Harley-Davidson chips from Seoul & Busan dealerships in South Korea.

Each chip is $3.
Shipping is $1 for one chip, $2 for two or more chips, shipped anywhere in the world.
PayPal Invoice will be sent with your order.