straight pipe exhaust

hey well i was wondering what straight pipe exhaust(with catalytic converter, no resonator, no mufflers) would sound like on my 96 monte carlo ls...i have 2 dual monza mufflers with 4 inch tips right how..it gives the car a fairly low rumble..but not too loud..id like my car a little louder and aggressive sounding still? is there any added performance to making it straight pipe or any better gas mileage? does any one have straight pipe on their monte or heard any other v6 straight pipe cars...THANKS

Not to sure about straight pipes on a v6, unbolt your pipe after your cat. or right before your mufflers if its not welded and itll give you an idea...i had a 3.4 firebird with the exhaust unbolted for a few hours and although it sounded good at idle it wasnt exactly good sounding at any rpm range. and thats a just a stroked 3.1