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I will never fit a 'tuning' box. I'd get the car remapped properly on a rolling road. but I won't do that either as there would be next to no power gains being a naturally aspirated engine. I just want to run it at lower rpms to see if I can get an extra 100mi to a tank as I drive a lot of motorway. was posting here to see if anyone else has done this, but if nobody has, im thinking of fitting a pd140 gearbox. unless anyone can suggest a better box to use. cheers!