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Although I've had a e46 M3 I haven't used either company so cannot comment from personal experience, but from what I've read on other forums both are well rated.
Try Ajec Racing in Gloucester - they deal with a lot of BMWs and track cars and race an E36 M3 / E30 etc - his daily driver is a E46 M3.... and they have their own dyno
Last edited by Freelance Badger; 30 June 2009 at 15:03.
Reason: more info
Colin at CNL Remapping can map these, but the gains on an M3 aren't massive to be honest. He travels and is based in Rugby. However, he uses the rolling road at the Leamington engineering/tech. college which is about 5 mins from Warwick. Might be worth investigating.
M3 Tuning in W Mids ?
