Exhaust for 6.0

[Redneck Z71]

In the spring I am looking to redo the exhaust to git some noise outta her also my cats are starting to go bad. Would I get better mpg with or with out em.

currently its stock till the magnaflow muffler then it goes into a 3in single side exit

I was wondering how much work it would be to do banks torque tube headers and then do a 3in tube exhaust all the way back no mufflers with 45's exit n 5 in tips. Should I do a x pipe, h pipe or just keep them not crossing.

Thanks Mike.

[=Lawrence=]

2.5 inch true duals with flowmaster 40 series sounds really good. whatever the collector diameter on the headers, that's the diameter pipe you should use.

[SierraDan]

Replace the cats with highflows, or get an ECU tune and then you won't need them.