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I set out installing ESS to get rid of the acceleration hesitation issue but it didn't solve it. At the same time, I felt the effect was rather small. After several months, I switched back to factory just out of fun, and found that WOW, it is a complete car - unacceptable power, have to step to floor at one of my favorite sloped street. NOW I realize ESS really have done a really good job. For the price and simplicity and reversibility, ESS is the choice. And I happen to have 3.5i, much more room compared to 3.5iS for improving by ESS.
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