I am going to get a 3inch u bend and make my own. I did my own 2.5 and this should be about the same just bigger. How much boost are you running? Shad said I maxed out the 2.5 with the 3 inch and more boost and type r cams, I should hit 500 pretty easy. I put down 454/315 at 24 psi about. I need a different boost gauge.