wen i got my s70 t5 it had the standard dumper still fitted plus a forge dumper aswell so i got a blankin plate off fleebay to remove the standard one and just keep the forge on wen i bought the car on my trip home i couldnt here the forge at all and its still the same with the standard removed still really quite but yet if i rev it it blows off louder than wen im driving like nite and day im puzzled like only been out incar couple times just to wee trip to garage get work done and never booted it really as was in town