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I removed my cat a long time ago, but left all resonator pipes. I had increased throttle response, it seemed to take less throttle, and the noise (out the exhaust pipe) did not increase at all...
I only ever put the cat back on the car for getting it inspected.
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~1990 Honda CRX HF - ZC SOHC 1.6L non-VTEC, Si trans, Illuminas, Neuspeed Race
1/8th: 9.90 @ 71.03, 60' - 2.41 (HMP '08) - 284K on chassis and ~110k on engine
~1996 Mustang GTS/248A - 1/4: 13.447 @ 99.75, 60' - 1.820 (HRP - 959' DA)
http://www.nearlysurrounded.com <-- Check out my band
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