Cat bypass will get you more results (headers even more) and shouldn't affect the CEL at all. We've got cat bypass for $495 - http://www.epiqautosport.com/pro_boxster_secondary_catalytic_bypass_pipes.php - and then you still have your primary cats.
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Todd
2005 Boxster S - Atlas Grey/Black, PASM, Sport Chrono, Bose
2006 Infiniti M35 Sport
2007 Cadillac Escalade (tow vehicle with bling)
'00 Boxster - 2.7l w/FVD ECU tuning, Moton double adjustable suspension, custom stainless headers, lightweight flywheel, dual Magnaflow mufflers, 18" CCR wheels, 911 front brakes in front, Boxster front brakes in rear, full welded cage.
http://www.epiqautosport.com/images/epiqtoddavatar2.jpg
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