You could look into getting some oem cats off of one of these new muscle cars. Mustang, Corvette, Dodge SRT. There already made for big power just have them cut and welded to fit. Just an idea, maybe i don't know what I'm taking about.
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PW 07 HR350Z R.I.P. Totaled by 82yr old woman 
2010 40th Anniversary 370Z
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