300ZX (Z31) Performance / Technical Discussions related to Turbo charging, Supercharging, Engine, ECU, exhaust, and etc. performance enhancements and Techical related.

I woke up to a quiet car, and I don't like it.

Old 04-28-2017, 07:46 AM
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I woke up to a quiet car, and I don't like it.

Hello all, so here's the deal. There's a car meet tonight so I spent yesterday preping my car. I start my car and leave for work today. At the Dunkin drive through I put my window down and boom, car sounds no different than a Prius. Floor it down the street and I have NO power (but now that I can actually hear my air intake it sounds sick). So here's the thing: has anyone ever heard of you cat getting all gunked up OVERNIGHT? We're talking the exhaust going from ear bleeding loud to pathetic attempt at sounding race car in about 10 hours. Also I'm done work at 7 and we have to leave by 8, any quick fix to make sure this is a cat problem? If you think this could be anything else please let me know. 1985 Z31 N/A, cat-back straight pipe, cone air intake, was a vacuum leak but shouldn't be related.

Thanks in advance.
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