because it won't throw any trouble codes, GTM test pipes have an L-stem and keeps the O2 sensor away from the main flow. I've had it for about 200 miles no issues
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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