My 1995 Tercel had a new exhaust system put in by a mechanic in Maine where it is registered, and apparently the cat got clogged right away because when I drove it away from the shop it would falter when the rpms were at upshift levels.
Then it stopped altogether and wouldn't turn over. I pushed it over to the side of the road and took the pipe off the manifold. Started right up (loudly of course).
What I would like to do is cut the cat out and put pipe in its place, so the exhaust would go straight to the muffler. If it were registered in Mass, 1) would that be legal? 2) would it burn the exhaust valves from insufficient back-pressure?
Yes you need one to be legal.
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