Green thanks for the tips. I think I will do everything you are doing. I think I have an exhaust leak near the engine so I may have to get new gaskets to be safe. I may even drive up to your shop and have them do it all for me since they will be familiar with the setup.

What would the high flow cats do? Is that to get more power and then only get an emissions pass with the ECU flash, or in your case, the shark injector?

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2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles