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Wish I could help. I put SOUL HF cats on my 996 but not the bypass pipe. The HF cats added a nice little growl to the exhaust note and were very high quality. The install was difficult only because my car was originally delivered in Chicago and the rust was a pain to deal with. Great fit/finish on their products. Good luck. Have you called them directly? I talked to a SOUL rep when I was buying my cats and they were very knowledgeable and helpful.
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Jerry
1983 911 SC/Carrera Franken car, 1974 914 Bumblebee, 1970 914-4, 1999 323ti
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