I was just looking around E bay and noticed several different "chips". I read some feedback and I saw some that said it was just a resistor. I'm just wanting to know about the performance chips that are for the SPI and if anyone has any, what difference did it make.

yeah, most of the stuff on ebay are just resistors that go inline with a wire from the MAF to trick your PCM into think that it needs to put out more power. The only chips I know of are
Diablo and superchips, but ... For those of you looking for chips (http://www.focusfanatics.com/forum/showthread.php?s=&threadid=13566)

jet chip makes one for all 2.o's it fits the dohc, and soch(spi)