97 180sx...
cat back exhaust..
After I rev it, and the revs die back down there is a fluffy noise coming from under the car... i suspect gasket.. (not sure if its before or after cat area)

Correct?

Best place to buy new gaskets.. i know it will have to be a genuine nissan gasket, but where is best place to get it?
I was up in nissan dealer there last week buying stuff, and Im not really sure how good they are price wise..

And which part of the exhaust system should i upgrade next?

As i can think of a few other bits and pieces that might be be more useful for the time being.. before i but mani's etc..


Thanks.