A budy of mine sent me this link asking what I thought about it. I told him I never know of anyone doing anything like that to the 15 series turbo. Has anyone ever tried one of these??
http://www.xsboostturbochargers.com/products/billet-turbocharger-compressor-wheel-mhi-15g-td04/
http://www.xsboostturbochargers.com/products/billet-turbocharger-compressor-wheel-mhi-15g-td04/