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Hi Bob,
Glad you like it; I found it to be quite an improvement on my car as well. Throttle response was much crisper all across the board, and initial tip-in was considerably improved as well, which really helped driveability.
I don't think using 91 instead of 89 is going to do you any good however; you would need knock-sensing capability to take advantage of the higher octane, and the 3.2's DME does not have that. If your car doesn't ping on 89, then I would stick with it. There is one additional DME fuel-quality setting which is located under the driver's seat. For the life of me I can't remember exactly what it is now; whether it's a dial on the DME, or a jumper or what, but do a search here on it and you should find some info. Make sure you're set to use the best fuel quality as that will make a significant difference according to some people. I checked mine and it was as it should be, but you'll want to take a look I think...
ianc
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BMW 135i. Nice. Fast. But no 911...
"I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79
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