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It's because there are no easily available or cheap tools or software that allows fairly easy ecu tuning like the BMW's Siemens ecu.
I only needed a k-can obd cable + 20pin adapter, and then just downloaded softwares required to download the ecu bin file to computer and upload it after changes made; Romraider and Siemens flash tool.
But as said earlier , the stock ecu (Siemens MS42) has it's limitations and the best solution is going aftermarket.
Which works fine, because the BMW is registered the first time on 09/1999.
OBD test is required on cars registered 01/2001 or later, and it's a problem if going for aftermarket ecu.. I could take the emission test with another car with a working obd port, but sometimes the inspector wants to test the emissions anyways and that is when it would fail MOT inspection.
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