They're just curious and want to see you gun it so they can hear your car.
That's fine. Someday you might get lucky and they pop their motor. When I had the 350Z, some idiot in a Camaro decided to drive through the left turn lane narrowly missing me on the right lane. I slammed the brakes and got behind him (single lane), and he sped off like a mad man. A few seconds later I drove through a plume of smoke, and then I saw the driver and his friend parked on the side of the road with hazards. White smoke was spewing out from the engine bay and inside the car. The hood was up, and both stared at me with a stupid look as I casually drove by.
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