It's cut just after the last cat on each side. I ran into a problem installing the Carbon fiber system on to my TSP headers with off road pipes vs hi flow cats. Apparently the off road pipes and the Borla zl1 catback are the exact same tube size so there was no shoving the pipe into one another then clamping. I had the notch the Y pipe and the off road pipe and hammer them in to one another (one would expand the other would contract) I tacked welded any leaks I saw. I don't have a pipe expander which would of been the correct fix.. they are cheap just didn't want to wait.
https://www.summitracing.com/parts/l...hoCsvsQAvD_BwE
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Kong Ported 2650, Crawford Racing Port Injection, Weapon X 112mm Adapter, NW112mm TB, Livernois Ported LT4 Heads, Lingenfelter GT32 stealth cam, Haltech Elite, and Carbon by Trufiber