wouldnt trust them as far as i could throw them. they melted 2 pistons on my zetec turbo engine and never let on. owner collected it and went to drive away an it would hardly run. took it home, stripped it down, 2 melted pistons, and a fooked block. according to them it had nowt to do with them. i have other stories which are very similar. dont do it. i told the owner of my car to take it to motorsport developments and get a live map. he didnt listen and it cost him best part of £1500. be warned!!!!!!!!