you can't really say that your FI is louder than tomei, because you don't have a true FI exhaust lol. you have straight pipes.
only reason i don't like tomei is, because it's a single exhaust and this car just looks weird with one exhaust. now if they made dual, i'd consider getting one.
and as stated, exhausts usually make the same power 1-2whp + / -
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2 plus 2 times 2 = ? ... hint, it's not 8
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq