well i think an udp is one of the best mods you can buy for the money. it frees up noticable horsepower. i have the esslinger udp, i paid $100 and i got about 3-5 more horses from it. cam gears when they are properly tuned can get you a good 7- 10 hp to the wheels. someone please correct me if im wrong.
Haven't done anything with cam gears but when I installed my UDP I could tell a difference
in throttle response, I've never done a dyno so I couldn't tell you how that equates to additional WHP. I would get the UDP first then cam gears but that's just my 2¢.[idea]