Absolutely! Your shooting yourself in the foot if you don't, stock pipe is only 2" in front of the Y. Are you running headers yet? If not 2.25" bpipes and 2.25" ypipe will be better for low end. 2.5" to 3" works great with headers and Uprev. I have a whole kit on the website so if the shop charges you too much you may get my bolt on stuff cheaper. It's all stainless and mandrel bent also.Since you do builds and I honestly know little too nothing just what these "shops" tell me maybe you could give me a little input. So I had the resonators deleted and they went with stock piping back to the Y then about a foot of 3" piping in to a 3" in/out bullet then dumped before the axle. The new Y pipe(that hasn't been installed) is 2.5 in 3 out. Should I have the shop make the pipe where the resonators were2.5 all the way to the Y?