^^^^ What he said.
Most, but perhaps not all, tuning boxes are sh*t and can lead to blocked DPF's and engine lights etc. They invariably work by frigging the readings from sensors.
Remaps are always the better option - Polestar, MTE and RICA seem to get the best reviews on here.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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