How can I make my Jeep Grand Cherokee Louder?
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flow masters offers all you need to get that nice powerful sound you want.as you are increasing the rate at which the exhaust is evacuated from the engine with the flow master,i recommend adding a cold air intake by K.&.N.,which will work perfectly with the new exhaust.with both more air in and more air out the engine will have increased performance,and some improved m.p.g.both of these companies have good web.sites and you will be able to match the proper parts for you jeep.
Take the muffler off.
take the cat off
wont be legal, but it will be loud
or u could drill holes in your muffler.