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I was initially tuned by Pray, then switched to GPI.
I am only FBO. With pray, he got me the intial tune real quick, but there were no revisions. He basically said it was bang on. This was with intake side done only. Then I added castless 2 inch headers, sent him another log with his initial tune. He said it was bang on again. It took him 2 months to tell me that. So, I got zero revisions from beginning to end even after adding headers in between the first and last log. I got returned by GPI, got 3 revisions with no parts swaps in between. Revisions came within 24 hours. Let me tell you though, looking at the logs, Pray added a degree or two more timing than GPI did and niether had anything register from the knock sensors. My car might've been faster with Pray based on that but it might be been slower. I couldn't tell the difference, but the GPI tune definitely worked better on rev matching. Prays tune would sometimes hang the revs way high when shifting out of gear at low speed.
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