This is only due to the straight through nature of a cannon style muffler, there are heaps of other styles with this configuration, Jun bl, hks, etc etc which do a better job of keeping the noise levels down!
The cat and resi are not particularly restrictive compared to oem headers, piping, and muffler. Factory honda cats actually flow quite well, so unless forced induction is on the table, i wouldn't bother replacing the factory cat/resi with expensive aftermarket items!!!!
wen i got my 2icnh catback exhaust system put on i had the resonator aka hotdog changed from stock to a high flow one and yes it does help its not that expensive either i paided $150 for the catback piping and high flow hotdog into my sports mufler...very nice tone and better response all round
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