Stuck between a rock and a hardplace. I have a 4 inch catcack system with a supplied midpipe. Its a VWR system and the problem is, is that I have the HKS manifold. I could do one of two things, get a dp/mp from another vendor or swap manifolds which I really dont want to do. If anyone wants to build me a dp or can recommend someone that can make one, I will pay and try to give the best measurments I can. My local sources are very limited and its a dificult request, but maybe someone has fabricated something with a similar setup. Thanks for the help.