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Message: <blockquote data-quote="fabianyee" data-source="post: 497003" data-attributes="member: 6">to go above 25% upgrade, there is another form to filled and submit to the Engineering dept.. Totally legal as long as the engine is part of the car model range and of cos of the same manufacturer.. so E36 has 1.6 all the way to the 3.2 in the M3.... so it can be done and has been done before... However, u would need to double confirm whether they have changed the rules... Breakpopin (one of the members in the forum last time) converted from 1.8 to 2.5, no issues.. Paid the runner to submit all the relevant forms and that's it.</blockquote>