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Yeah, those guys are garbage. When I had my Subaru Legacy 2.5GT, IPT sold an upgraded valve body for $795. One of the board members purchased their service to get his valve body worked on, put it in the car, and really didn't feel much of a difference. A year later, his auto started slipping so he decided to build his own performance trans. He purchased a second trans and in the process of building it he compared the two valve bodies. The ONLY difference was 1 beefed up spring to change the line pressure. FOR $795!!!!
Well, the Legacy's trans computer is programmed to override the valve body line pressure whenever it read too high through the use of solenoids and magic....... long story short, it was a waste of money. Multiple members logged line pressure table and compared them to members with the IPT valve body and they were the same.