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Message: <blockquote data-quote="Calvin Tan" data-source="post: 275844" data-attributes="member: 167">Hey bros, sorry for the late reply. As for the voltage stabilisers and performance ignition coils will improve somewhere around 10hp. For more information you can find out at <a href="http://www.EurocarMotorsport.com" target="_blank">www.EurocarMotorsport.com</a> or <a href="http://www.okadaprojects.com/usa/home.htm" target="_blank">http://www.okadaprojects.com/usa/home.htm</a> and <a href="http://www.sunautomobile.com/" target="_blank">http://www.sunautomobile.com/</a> Warranty wise, not so much to worry about since this is plug and play kind of stuffs. You can always replace it back to stock before going for any warranty claim. Hi Juan, the E90 323i has the same engine as E60 523i, the spec and improvement is the same as E60 523i</blockquote>