unless you are pushing past 300 HP in that box you dont need another fuel rail. the stock ones should be good for at least that far. but without forced induction (turbo or SC) you dont need to boost the fuel flow. you would need bigger injectors before a fuel rail.
but hey.. i got one for my integra and I only have intake header and exhaust.. but it does have that bling factor. I know I dont need it but I was in that NOOB tuner kid stage and I bought almost everything that fit my integra. I have had the rail for over 2 years.. maybe 3. and finally installed it a month ago. aboout all it does is show me my fuel pressure.
to me it used to feel like it had more power , but I think it was because I went from driving a 100 HP box to driving a 150-160 B18B Integra. (I own both BTW) so it could just feel
like its faster now... or powerful