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IS THERE A DONUT TYPE GASKET BETWEEN THE Y-PIPE AND THE MUFFLER ON THE 92 550 EXT, RIGHT NOW THERE IS NOT AND OIL IS BEING SPRAYED ON THE ENGINE AFTER TIME AS WELL AS EXTRA EXHAUST NOISE. WOULD THIS ALSO CAUSE A BACK PRESSURE CHANGE? LAST THERE IS A GROUND WIRE THAT IS ATTACHED TO THE SIDE OF THE ENGINE AND WAS AT ONE TIME GROUNDED TO THE BELLY PAN, DOES THIS NEED TO BE RE ATTACHED?  
 

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I would hook the ground wire back up to a solid piece of metal so you dont short something out.  Do you have any dummy lights that aren't working or anything?  If you do, that's probably why...
As for the pipe, I don't think that there is any type of gasket or donut ring that goes between the pipe and Y pipe.  I believe that there is just a "bubble" that they fit over and are held together by the springs.  The only place there is a gsket and ring in where the Y pipes mounts to the motor and where you pipe goes into the silencer.  As discussed in a previous post, get some high temp. sealant and seal it all up.  Works like a charm.
 

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Definately attach the ground wire.

I looked at brownsleisureworld.com and it does appear you are supposed to have 2 donuts (gaskets), 1 after the y pipe and 1 where the exhaust and canister meet.  And yes this would affect back pressure.
 
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