I have a Greddy T78 turbo and currently the Greddy SP exhaust. I want to upgrade to 4" from the turbo all the way back. I see WOTM makes a 4" DP/MP for Greddy turbo's and I was wondering if you did too because I definitely will be buying the BL 4" exhaust. I know I can buy the 3" to 4" adaptor but I would like to get rid of the 3" DP. I had talked to Justin N. about this and he told me you might be able to help me out. Thanks.