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Message: <blockquote data-quote="thule" data-source="post: 731567" data-attributes="member: 14511">There are plenty of options to upgrade your otherwise underpower 523.. Initially I wanted to suggest BMS Powerbox for N52 engine but apparently it doesn't work for F10(only for E60)... If you have the money just do it all of else, do it stage by stage like below:1) change the exhaust to quad type.. Remus will be a good option due to its price compared to other brands. Light weight and back pressure reduction, you will feel the car pickup faster. If you want more, change the exhaust manifold as well. Advantage? Addictive bassy exhaust sound everytime you floor the accelerator. Oh yes.. You might have to change the rear diffuser (or mod) to fit the quad exhaust.2) aFe or BMS cold air intake to replace stock air intake. Potentially add few hp to your car but can be loud at the engine bay everytime you press the pedal.3) once everything done, go for ECU tuning finally and remap your engine to suit all settings. They provide dyno afterwards to check the increase of HP.All the above can be done at any BMW specialist mod shop but if your car is still under warranty and you don't want to risk it, wait until it's over and only then you do. Thule signing off</blockquote>