I'm looking to replace my resonator with a aluminized steel X pipe, stock exhaust pipe is 2-3/8" OD, with 1/8" steel wall, I can get 2-1/2" X pipe (with 2-3/8" ID) outlets. Now, with the pipes sitting inside the x pipe (see pic, similar theory), would it create lots of back pressure or turbulence? X pipe sits 6 ft away from the engine. Should it be connected with "step up" pipes to create a smooth transition ( stock pipe goes into a bigger pipe)?
My dilemma:
OEM X pipe $800
Aftermarket X pipe with welding job under $300