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It really depends on what you're after. They're very capable and remap really well but i suppose they are a bit linear.
5 door e92 M3? (Unsure which e90/92 is the right model number?£)
I'd still do it if you're intending to keep it. How many times have you read people changing the belt then weeks/months later the dephaser pulley singing you the song of its people?