Well, I bought a tuner from OE Tuning. It's a Dimsport mygenius tuner. They loaded a few custom tunes for my stock 128i. Let me tell you it is pricey but it works well. I can really tell in the way it pulls. I haven't tried the most egressive setting but the mid, 93 octane, setting works great. If your looking for some real hp for $595.00 I would say call them. I bought mine off Amazon
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