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GT with Whipple and Bassani xpipe/headers throwing codes


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My brother-in-law has a 2005 GT that has a whipple HO kit and bassani headers and xpipe WITH cats that keeps throwing P0171, P0174, & P0430 codes that I believe are cat codes (lean, timing, etc). Anyone had any experience with this setup and any hints on how to get them to work? I believe the tune was a custom tune by Dallas Mustang. He's been back several times but they haven't solved it yet. Thanks!

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171 and 174 are usually vacuum leaks. Check for vacuum leaks. Check all the hoses on the SC vacuum tree near the brake booster and fuel pressure sensor and make sure they did not blow off under boost. Use tie straps on everything you can. Good luck.

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