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A sleeper car built out a large truck, van, or SUV. Spool refers to a Turbocharger, the power adder modification most of these vehicles use.
Ferrari: ha, look at the slow-ass Tahoe
Tahoe: *is fast as fuck*
Ferrari: WTF, must be a spool bus
A badass lifted duramax diesel truck.
Wow look at streepspeed717's spool bus