Hi there guys

have purchased a cheap 'tuning box' from ebay for my c max...attaches to the MAF sensor and claims to add 'up to an extra 30bhp' for a very small price (the box only cost a tenner)

was wondering if anyone has actually used one of these and what effect it had?

 

these things are a waste of space an can even make your car slower!!!!!! Get a tune/remap it wont cost you a tenner but on the upside it wont fook your car!!!!!