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Originally Posted by BKK 5
I'd also be interested in tuning options for the N20. I have a 528i. Heard there are a couple chips available, but nothing substantial. And it doesn't appear that Dinan offers are any performance upgrades either.
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For your 528i, I prefer a TMC ECU, it's efficiently bring the different on performance and it is cheaper.
It said add up to 4x-50hp to my car at their website.
http://www.tmcmotorsport.com/