For safety checks, the exhaust must exit after the passenger cabin. As long as the tip goes past the cab it's good to go. SUVs were arguable, since we would consider the most rear window as the end to the passenger cabin, we discouraged people from chopping and dumping directly after the muffler on suvs.
Also, this can be used against you if pulled over or vehicle impounded and thoroughly inspected. Safety check laws and the hawaii revised statues that the law enforcement officers go by are two different things. §291-22 Regulation of exhaust pipe and muffler. It shall be unlawful for any person to drive upon the public highways any motor scooter, as defined in section 286-2, the exhaust pipe or muffler of which has been so changed from the factory design as to increase the volume or audibility of the explosions within the motor thereof.