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Thanks Ron, but I want too know if it will affect low idle after a long warm up drive. I had done it to a 90 eclipse once and the low idle could not stabilize, yet the increased power was amazing. Anyone out there tried taking off the cat and putting a 2. 5 inch test pipe on an 86 944 Non turbo? with stock muffler and stock 2.5 inch exhaust thoughout.