I plan to do exactly what you mentioned. But was'nt the wagner mid-pipe intended to bolt-on to the stock axle-back??p5sundevil said:Now if your getting the DP with a CAT that makes sense. That I would get his midpipe with just the resinator and no cat, or 2 resonators....no need for 2 cats when going aftermarket. and at that point if all the piping is bigger than your HKS you can either have it cut and have 2.5 piping welded to the can or get a 2.5 axle back to replace it.