has anyone installed a RENNTECH ECU?
10-16-2007, 10:48 PM
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07 E550
has anyone installed a RENNTECH ECU?
i was wondering if anyone installed the Renntech ecu and did it really gave the horse it says it does. Or which on is a good ecu. i want to put more power in the e550 at the end of the year when i get little more miles on it.
