I have had 3 on mine in the past 2 years
First was a bailey and it worked fine and sounded ok, second was a turbosmart supersonic which was really loud and now i have the turbosmart twin port fitted which is really quiet as it is set to re-circ and dump just now so you only get the "GAY" noise as its been discribed when your putting the boot down and next to nothing around town
At the end of the day its your car and it really comes down to personal choice depends what you want