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Here's the thing. I use to run the stock Y with cats and no problem. The weirder thing is, I drove the car today and it hasn't backfired yet.
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-Felipe
2001 WS6: SDPC LS7 Shortblock, L92 heads upgraded for .600 lift,
L76 intake, Nick Williams TB, Comp Cams 224/228 .581/.588 114+2LSA,
1 7/8 LT's, GMMG
waiting for some boost
2003 Silverado 1500HD
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