The first thing you've got to understand with this custom N600 is that someone didn't just slap a bigger engine into the little happy chassis...no, this was a complete transformation. A Dr Jekyll to Godzilla kind of transformation. It starts with a 1998 Honda VFR800 motorcycle engine mounted in between the front wheels.
The builder didn't just take a motorcycle engine and slap it into a front drive econobox in a weekend and call it done. This was a serious undertaking that involved a transformation to rear-wheel-drive, a paint job, custom interior -- just read the sellers 32 page build log here on locostUSA forums. With 110 horsepower and a 1400 lb curb weight this thing will be a blast through set of cones.
The attention to detail in this little custom is what sets it apart from the typical motorcycle engine powered custom, particularly the steering wheel mounted paddle shifters. If you are going to build something insane like this, you might as well do a good job.
The seller includes a link to an autocross that looks more fun than a barrel full monkeys.
See a better bike powered 4-wheeler? firstname.lastname@example.org