exhaust system help!!!

hello,

ive got an ITR and ill be getting a set of header with a 2.5" collector.
should i get a custom made 2.5" b-pipe and use my muffler atm with a 2.25" inlet (which i really like the sound coming out) or go with the jdm brands catback?

the only reason why i dont want to go with the jdm catback is that i would need to modify the b-pipe to fit the cat because im getting a set of hytech header :p which the cat needs to be extended further down. Modifying the catback means that it will lose its value when i resell the system.

im also using a 10 000km old hi flow cat with 2.25" inlet/outlet. should i get a 2.5" to match the header?

So what should i do?

thanks in advance

i'd get the custom B pipe. Its at least gonna fit your headers 100% and also it will be cheaper. The savings will enable you to spend on other mods like a steel cat.

would i loose abit of power having a 2.25" inlet muffler?