Hey man, I happen to own two of those sh!tty Type R's and am interested in your subs. Please don't laugh, but what would the performance difference be? My current box is a prefab job with about 2.2ft per sub. Will the BTL's fit in this, or would I need a brand new box? Also, if I need a new one, how much air space is required per sub, ported or sealed? I have never heard a BTL and an very pleased with the output of the Type R's(I am a little new to car audio). Lastly, I have a Memphis 1100 watt amp on each Type R. Would this be enough RMS power for the BTL's? Does FI offer a warranty on their subs? I went to their site, but it appears that I need to contact them for any info. Thanks for the help.
Josh