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The time has come to replace the stock exhaust on my BRZ. Definitely doing Perrin from what i've seen on other cars and on here. Has anyone got the 3inch exhaust vs the 2.5inch? The only video I can find with it has front pipe and downpipe so it's hard to put an ear on the sound of it. I'm assuming it's going to be a little louder than the 2.5, but with no resonator options, i'm not sure if it's going to drone. Any thoughts?

Cat Back Exhaust 3.0" for FR-S / BRZ
 

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Imho, the full 3 inch exhaust (header back) is not really a necessity unless you plan on boosting the car later.
It seems in the case of 2.5 vs 3.0 the 3 is slightly louder in a logical sense, but I don't own the system so I can't say for sure.

Your best bet would be to ask Perrin themselves. They have superb customer service and should be able to assist you with anything regarding their products. If not, you can also ask FA20club as they cater to anything and everything related to the twins.
 
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