guys, i know uve probably heard this all before but i havent saw the answer im looking for. I hav purchased a cheap dump valve off ebay simply because my mate with an a3 turbo has one and it sounds ok not oo woooshy and not too quiet its just right, but any way it is a blow off valve, now, i know that these arent good for the vag engine but is that only becuse u have to block the pipe that goes back to the airbox? because i was thinkin if i was to fit it like a standard dump valve ie, boost pipe in then pipe that goes to airbox fit that over the trumpet of the blow off valve would that cause problems? as in theory it would be the same as standard dump valve or is it the holes in the side of the dump valve that cause problems? cheers and sorry for bringin a common subject up