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      04-19-2010, 02:06 PM   #113
roundel335
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Drives: 13 335i Sedan, 11 128i Cabrio
Join Date: Apr 2010
Location: Leland, NC

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Just FYI - I also tried the cheap tunes (SSTT 1&2) and they did provide more power, but there's no parallel warranty with them like there is with Dinan, nor did they provide the same kind of power increase as the S2 software. Dinan Stage 2 requires only that you have a factory oil cooler; stage 3 requires their aftermarket cooler and they recommend an oversized intercooler as well. Another thing Dinan does is increase water pump speed to increase coolant circulation when the boost goes up. There's a lot of careful code modifications with lots of testing to make it pretty bulletproof. I'm watching closely to see if this aggravates the high-pressure fuel pump issue, but so far, so good.