Have you tried loosening the triangular 3 bolt clamp attaching the cat pipes to the headers?
When I fitted my cat delete pipe a few months ago, I really battled to attach the U pipe to the muffler with the triangular header clamp tightened. Once loosend, I could push the sleeve over the butted up pipes, nipped them up and then tighten up the 3 bolts reasonably easily.....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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