You have to use the entire 987 system. You also have to extend the 02 sensor wires. Other than that it bolts up nicely. Keep in mind though that 3.4L 987's have larger exhaust ports than 996 3.4L engines. While not a huge problem, it does cause you to loose some potential power.
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1999 Boxster 3.4L
2007 BMW 328i
1992 Jeep Wrangler
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