So I ordered the ESS X5M tune through Ilia at IND. ESS is conservatively estimating horsepower at 40-50whp gain. Call IND for more information.
　
From ESS's website
"ESS X5M/X6M Performance ECU software is a result of extensive testing and exact calibration of ECU parameters to allow considerable performance gains on an otherwise stock car. The ESS S63 performance software is developed and tested in extreme heat in the Arizona desert as well as extreme cold temperatures in Scandinavia. Typical gains are in the 40-50whp range. Catless exhaust option available upon request."


IND drop shipped a programming module to me. With it, you download a copy of your stock software. Then e-mail it to ESS. They do their magic and e-mail it back. You then upload it to the car. This allows you to be able to swap back and forth. The process was simple until the user (aka me) made a mistake. Without pointing any fingers (at me), IND and ESS were able to get it back up and running quickly. At a great deal of their cost (time and money). Thank you to both for their excellent customer service and communication.

My butt dyno is very happy with the upgrade. In a 5000lb truck with 550hp, a 40-50whp gain does not seem like all that much. The big difference is the mid-range. Between 3000 and 5000 rpm there is a significant increase in power without having to stand on it and really wind it out. It has actually made everyday around town driving more livable.
　
Love it and highly recommend.
Marc

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