Aside from Mustang building, I also like to wreck my race quad and tool myself up every other month or so. Seriously...I end up buying about $200 worth of parts every time I ride it. I dont' think I suck at riding, I just push the limits a lot. And crash.
I have an '06 YFZ 450
-whacked fenders off
-DG exhaust
-Moose Racing Jet kit
-Elka Triple rate shocks all the way around
-Houser +2 A-arms
-Axcaliber axle
-Houser steering stem
-ITP wheels
-ITP Holeshot MX6 tires
-Intake kit
-Protaper bars & clamp
-Bomb Squad graphics and seat cover
-DG front grab bar and nerf bars
-Wave rotor on rear brake...can't remember what brand at the moment.
-More stuff
The quad is worth about as much as my Mustang...and...I can jump it 10 feet into the air without suffering too much damage.
Pic: The pic is kinda old...I've done some more damage and thusly replaced some parts since this was taken

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'99 GT - My increasingly expensive DIY project car...
Vortech V1, Moser 31-spline axles, FRPP diff. w/ 4.10 gears, Steeda Tri-Ax Shifter, Shany Custom pipes, JBA shorty headers, Powerslot rotors, Tokico D-specs, H&R Sport Springs, Steeda Strut Brace, MM X-duty Lower Control Arms, Autometer Phantom Boost and Wideband AFR guage, Custom Rear seat delete, Royal Purple, NGK, BFG