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I installed my gibson exhaust last nite and overall i like it, but i've notice that it seems quiet until my engine gets warmed up. Is there a break-in period for new exhausts? I believe i remember reading they get a little louder once its broken in some...
gibsons arent known for being loud but for having a deep tone to them especially with a v6. and yes there usually is a breakin period. if the tone doesnt change from stock there could be something wrong with the muffler.
Your engine is going to have a difference in back pressure, so itll adjust to the new exhaust after about a month and no more. For the warming up issue the heat comes into play, it greatly affects the sound.