OK. I've got to put in my 2 cents worth also. I have the Jet Performance Chip installed on my 2001 PT. I also have a JBA header, Magnaflow catback system, cold air induction and a sport air filtration system with NOS soon to come. To date the biggest performance boost that I got was from the Jet Chip. The Jet Chip was formulated to work with the automatic and one of the beauties of the chip is that it changes the shift points of the transmission. Now it shifts to low sooner and holds each gear longer. I won't dispute anyone on the horsepower gains but my 0 to 60 time changed the most with the installation of the chip. Believe it or not the chip was a better investment than the JBA header.
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