Karl is indeed very good and I would have no problem recommending him and often do, but would he be happy doing, for example... a 7 litre DAF truck like I did last Monday? Or a Yamaha 2 stroke outboard like we did a few weeks ago? Or the Fastrack tractor James is doing tomorrow? Maybe not.
I think we need much more info to answer your question.

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i didnt mean to offend any body but original post just said mapping so i gave my opinion of who i would use as par my personal experience as regard trucks the last one i bought 6 months ago being a v8 mercedes tractor unit i had that mapped by bill at collins performance but again thats only my opinion and thats all so sorry stu.