The cheapest would to do a resonator delete and put straight pipes in. It would be a little louder and deeper, but you my have some drone.
X-pipes or H-pipes can be had from Magnaflow or Flowmasters.
2005 GTO-PONTIAC EVOLVED
IMPULSE BLUE METALLIC/BLUE INTER./A4/K&N CAI/TVS1900/GATES HD BELT
3" FLOWMASTER CAT-BACK W/SUPER 40'S/E2 CATCH CAN/160* STAT/OPTIMA RED TOP
SAP GRILL INSERTS AND SPOILER/TSW THRUXTONS STAGGERED 18" W/NITTO NTO5/DEPO TAIL LIGHTS
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"Fear God and Dreadnought" -Adm. Jackie Fischer...
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