If your gonna put an offroad pipe on the car grab the heatshields off the cat pipe and have them tack welded on. They will not fit the same as the on the stock pipe because of the diameter diff. Stuff some insulation inside it and paint it black so they cant see the pipe inside.
personally my car passes with an offroad pipe so it works out fine.
Hope that helps
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90GT---Edelbrock Performers, E-303,1.7 RR, GT-40 intake, 65mm TB, 73mm MAF, Pro 5.0 shifter, King Cobra Clutch, 3.73, shorty headers, offroad h-pipe, 2 chamber flowmasters, Compucar N20,crane HI-6, southside UCA's, Outlaw racing LCA's, TA rearend cover
Best ET on motor: 13.20@103
Best ET on N20:
12.06@115
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