Well the L-shape non-foulers are heavy. That could be putting a lot of stress on the welds, causing them to crack as they heat up. I have an UpRev tune, so I just had the catalytic CEL turned off and I'm running without non-foulers. I haven't had a single issue on my CNT resonated test pipes and they have 4,000 boosted miles (over a year) on them so far.
I know these are high flow cats, but they're made by the same company.
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'08 Infiniti G37s - Forced Induction Fed
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