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Just some public info about Active
Active has been established for 30 years in the US. They have a very knowledgeable & friendly staff. Correct me if I'm wrong but Active has over 20 full-time team members. Their level of experience with BMW is vast as they offer a full array of products & services for most BMW models.
ESS
Roman is in the US. Read that AJ goes back & forth between the US & Europe. You send the ECU to one address & now have a different business address. Not sure how many people work there. Looks like they only offer supercharger kits & software.
Let's say both products are great but I want piece of mind if something ever goes wrong.
Also, I prefer real world numbers vs dyno numbers. Each car is only capable of so much without other modifications to support the related parts.
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