| I honestly would do a PPE or KEnnedy Diesel air box mod. Its free so it fits the budget. I think MeyerPerfromance, DieselNut, etc. can hook you up with a good deal on an exhaust. I, personally, prefer MBRP 409ss turbo back 4". Ive installed 4 of em 2 Duramaxs and 2 PSDs, they fit awesome and have a lifetime warranty. Just me opinion!
__________________ 05' LLY CC/SB, PPE Standard, MBRP SS 4", BD Power Manifold, Autometer Phantom 2 Pyro and Boost, Kennedy fingered n plugged, cat grew legs, Belltech 1/3 drop, Michelin LTX M/S 265/75/16, 22 HWY/18 CITY.
KILLERBEE Designed Intake piece- Everyone needs one of these!
Rock it till it sounds expensive! 
Dont argue with a moron in public....Others may be confused on whos who. | 
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