depends on whether the exhaust is blowing from the top or the the bottom of the the exhaust, if from the top you will need an exhast bandage which might fix the problem, if under neath use exhaust putty such as gun gum , if the muffler rattles when you rev the engine,sorry but you will have to buy a new one this is not repairable.
patch it or take to a tailor
You can put a supercharger on any engine. All a supercharger is, is an air compressor that forces air into the engine. If you can find a compressor small enough and figure out a why to hook it up, then you will be good to go.
the rocket of Sir Novac Shemlot was launched on Thursday may31 at 7:40 and tried to land but exploded on June 3 1996 an 8:03
Try this web site - http://www.maintainyourcar.com
it has quite a bit of info about getting more fuel economy out of your car
Jeep Liberty should notice a decent increase in fuel economy, between 2-5%. It will make the car easier to drive requiring less fuel to do the same job