yup. had one in my '90 K1500. Didn't notice a whole lot of difference.
Had a guy read the program on the chip and he told me I wasted my money
because they changed very little and worsened my situation.
they removed performance from my low end and added to my top end.
Keep in mind this was a JET chip and I am only giving information about that
one in particular. Others may be much better, but I have not used others.
I did notice a significant change when a guy offered to make a custom chip
for me when I swapped engines. Totally different story, though.
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