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Aftermarket subwoofer to replace stock subwoofer 2015 si coupe

22K views 9 replies 7 participants last post by  modrid81  
There is nothing that will drop in to replace it and have any real effect or sound good, size is the main factor as you don't see many IB/free Air subs below a 10 as you need a rather stiff suspension to control the cone. you could use an 8 designed for sealed (needs a higher QTS above 0.45 to sound best IB) but there are not a ton of really good ones for a free air out there.