Airstrip Speed Trap

So my friend and I were going down the airstrip (Xbox 1) and he noticed that the fastest car is a Hummer H1 with a speed of 291.45 and its a B700. So I personally think the guy either glitched it or “hacked” and I just want some peoples input and thoughts. Cause I thought the fastest it could go was 190 or so. Please explain how its possible.

Players name is with club tag: [Mod edit- we don’t call out others on the forums -fyerball]

~Purple