I am looking to remap my 2008 E60 530d with 6 speed manual gearbox. Currently with 84000 miles and original clutch and DMF. All my motoring is motorway commuting. I want to know what is the best compromise in performance gain and sympathy to gearbox etc. I am in SE London/Kent so also need any recommendations. I have been quoted 300bhp and 700nm but believe this to be pretty much on limit.