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Without the cats you will not have a ca street car as it will not pass emmissions.
2nd cats may be removable perhaps.
I just put on a Top Speed cat back system so i'll report results with all cats still in place .
So far i noticed it has a lower throaty idle, but the system needs a break in period.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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