Take a look at this thread:
http://986forum.com/forums/diy-project-guides/41683-top-speeds-cat-back-system-installation.html
I added some clamps that got rid of the drone on mine. My problem was more of an air leak but I think the extra mass on the cat delete pipes helped the whole system. I'm happy with the sound and definitely with the extra little bit of performance.
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2001 Boxster S Lapis Blue
TS Cat Bypass Pipes and exhaust
iPad Mini Dash Install
DEPO Tail Lights
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