Sharkport/xport is about 30 bucks or so. U need a PC with a USB port and Win 98. It's preferable, but not necassary to be able to connect the PS2 to the TV and PC at the same time.
UncleMcgee, as far as the codes go, assuming U are using an NTSC game and console those codes are correct, and U have probably entered one or more of them incorrectly into your cheat device. Hopefully U have entered each part as a seperate code, and U can put the codes on one or two at a time to determine which one is causing the problem. Just make sure u use the body and color code together, and if U use the tranny code, use the gear ratio codes with it.