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Sorry to disagree but you are not gaining any performance going with no cats vs welding in some good 100 or 200 cell sport cats into those test pipes. Alternatively you could just buy some Dansk sport cats to replace the test pipes. I use these on 3.4 conversions. Either one of these will solve all of your ECU issues, not reduce performance and be more socially responsible by reducing the emission levels from your car.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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