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Welcome to CL! Glad you're enjoying your F. I've heard both the ISS and JoeZ. ISS QES has a nice rasp to it, and the DES has a nice toned resonance. I absolutely love the Joe Z/ PTS exhaust. It's got nice depth and it makes use of the stock tips. But Carson Toyota (l-tunedparts.com) or VIP Auto Salon (vipautosalon.com) should have the Joe Z. I believe Fitment Factory, a vendor on Club Lexus, carries both variants of the ISS exhausts. Have fun with your F!