any good or not

 

do they make the car sound any diffrent

 

I have one and it seems to have confused my MAF sensor at idle, (now sounds like a lapping tide when it used to be constant) not really noticed any performance increase though, give it a whirl at under fifty quid but not the best fifty quid I've ever spent, I also had a dump valve (re-circ) put on at the same time so it could be this that does not help the steady idle and again, not really noticed any significant change in performance for the cash, it is always good to spend on the scoob tough!!!

 

but did u reset your ecu??
try it