Dinan products are tried and tested tons of times before being put on the shelf for sale. One is not just paying for the brad but for all the work that has gone into developing the product. I have a friend who had his older M5 engine sent to Dinan, stroker kit etc etc and his car has been running over 2 years with not a single problem to date. If I had the 650, I would have done the Dinan upgrades in a blink of an eye. Pay more but peace of mind.
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2012 BMW 740i
2011 Mercedes E250
2010 Lamborghini LP670-4SV
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