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1995 993 Vibration/Cat Bypass

Engine

Vehicle Information: Year: 95; Body Type: Coupe; Total Mileage: 58000;

I noticed going and coming to/from Rennsport that there seemed to be a new vibration or resonance (in rear). My rear tires (pilot sports) are down to the wear indicators in the center (most wear in center of tires). Could that be it? All the exhaust seems to be tight. Sound sort of like the roar when passing an 18 wheeler on the interstate and pretty steady when you get to cruising speed. I know pulling that 75/140 out for the 75/90 Mobil 1 didn't do it, but that is all that has happened before the trip to Fla.How do the cat bypass pipes work. Where does the exhaust analyzer fit ? Now, it is in the "Y" where the two pipes come together. Does it just sample one bank? Will this alone increase HP and/or sound?Thanks again

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