I hope you aren't using 2.5, 2.7 or 3.2 headers. The port sizes on those headers are much smaller on those motors than the ports on the heads of the 3.6 L motor. You need to deal with proper headers before you deal with exhaust.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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