For me.. I have two of them. Cars, working on cars (mechainc), and detailing cars.
This is my baby, 2002 Chevrolet Camaro 35th Anniversary Limited Edition car. It features a plethora of modifications.. including aftermarket heads, headers, cam, valve train, complete upgraded fuel system, Procharger supercharger, custom front mount intercooler... the list goes on. Last time we tuned the car it put down 561 horsepower to the wheels... thats over 600 at the engine. Not to mention the 541 torque at the wheels too. I just installed a new radiator with bigger fuel pump and we are going to retune within the next week or so... shooting for 600 horsepower at the wheels. I have a new rear axle, driveline, and tires ready to install once we finish tuning.. then its time to head to the track. Should easily pull the front wheels off the ground with some slicks... and hit 10 seconds in the quarter mile, hopefully to see 130mph within that 1/4 mile. I do all my own work.. installing all the aftermarket parts as well.
She looks pretty tame in the pictures... but shes a beast inside. Rather pleasant to drive on the street too.. believe it or not it gets 25+ mpg on the freeway in 6th gear.