Don't buy a cheap £60 one. Fitted one to a Mini Cooper D and was quicker but smoked a bit which was not good as it had a dpf and should not smoke. Cheap ones just pump more fuel in. Then I had a guy come round and mapped for £150 and although the same sort of power did not smoke. He said 140bhp Audi's respond well to a remap and you don't have stupid dpf to worry about. I cannot comment on more advance boxes but benefits are quick removal. Just don't buy a cheap one!
My friend had one on a Focus and it was constantly in limp mode... my car's occasionally in limp mode too but that's unrelated and was happening before any mods, if anything with all the modifications I've done the car is healthier now than it was ten years ago.
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