XS Power Super RFL dump valve, fits any car. Was fitted to my 200SX, now have an uprated re-circ valve. As new, still with box.
£35 posted

what else would be needed to fit this to a a3 turbo?

Plastic T section and a small bit of pipe I think.

is it loud mate? do u know if it will work well on a a3? how much do u think it will cost for the parts? how hard is ths to fit?

It's a standard item so it'll fit any car. Get some snazzy Samco hose from Demon Tweeks. It makes a difference where you put the valve along the hose, closer to the turbo acts like a bleed valve.

It was on my S14, running 14 psi, and made a decent, but not loud, ptisshh. They work better on cars without an Air Flow Meter. As said, you might need a T-setion, and a bit of hose, but TurboXS make fitting kits for specific cars, as this BOV is identical to their Type H and S BOV's, or you can get universal ones. When it was fitted to mine, there was already a pipe to the standard re-circ valve, so it took me about 15 mins to fit. Piece of piss to fit really. Shouldnt cost a lot either for the T-piece etc.