06's have a full 4" ss exhaust system.

 

Didnt know stock was SS, for less than that would be aluminized. Not SS

 

I have thought very hard about straight piping it. However, I have a company car so this is my wife's daily driver and I know she would not care to have it too loud.

 

wow i was educated today... I did not know that....

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Yeah she'd be a no go on that....

 

Silverline has got turbo back. That's how my duals are. Might just have to ask for the part number and relay it when ordering the exhaust.

 

Got a 5" system from Full Spectrum Performance, found on Ebay. Cost for the turbo back system with muffler was $350. Aluminized, not SS. 5" is overkill really, lost a little bottom end but got that back with a QZ module. Sounds great, not loud. Major difference in how the engine breathes. Runs smoother under acceleration than with stock. Enough pipe to delete the cat too.
Stock 4" is plenty and if you can do it yourself, just get a high flow muffler, cat delete pipe, and big tip. Save bux. I've got a 6" stainless tip, looks great.

 

Don't gut the CAT it is a $1800 part so I hear. Just get the Delete kit if you want it gone. If I were to do it all over again I would just but the Magnaflow muffler replacement kit, It's like $200. Strait pipe is too damn loud for me. I have had Flowmaster-Sounds great minimal drone but EGT was higher then I thought it should be. AFE Turbo back absolutely no drone, quicker turbo spool, fairly quiet but I was not a fan of the exhaust note or idle sound. Aeroturbine the best sound I've heard on a Cummins but major drone and super loud. Now I run a 30" magnaflow and it is perfect, no drone and quiet until I want it to be loud. My wife makes fun of me all the time for how many mufflers I have had.