For me its not how loud the exhaust is. Its the drone at 2-3k but I live with that. If your getting this exhaust you must want to hear it so Id go with the 12s. Im a little older than some and I dont like over bearing exhausts but do like the rummble of a nice exhaust note and this one has it. Now if doing the full exhaust with HFCs than 18s might be better. Either way you will like the sound and it will turn heads. Im thinking about the FI HFCs with resonators and hoping it wont be too loud and waiting for a sale or HFC war between the companies.
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2010 LS3 C6 Silver coupe corvette
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