Bought GTM test pipes off a forum member, had the L stem for the sensor, great sound no cel, but you will get a smell in the cabin. I think the rasp is primarily caused from a 2.5 HFC/TP going into a less than 2.5" y-pipe.
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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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