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I can't answer your specific questions, but I've got a Timevalve SS system on my 95 wagon from the cat back that I put on in 2000. It was a bit more than factory at the time, but I've not had to touch it since. Cat is still original at 180k miles.
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as ever
Paul
1989 560SL
1987 300SDL
1987 300TD
1983 BMW 633CSi
1972 280SE 4.5
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