Follow the sheep? wtf..
People use FMIC kits because they work. $200 for a side mount, and for $130 extra you can get a FMIC kit which will do a the same job, and will support more than 200rwkw if you do chooses to go there later.
I mean he has an Rb25, all he is has to do is boost it to 13psi or so, with exhaust adn shit, and that side mount becomes useless as he will make over 200rwkw anyways.
Why would you bother going a sidemount? I know I wouldnt.
He will put the side mount in, boost it to 13psi, get about 200rwkw, drive it hard, either on street or track and the thing will suck, then he will want more power and he will have to rip the side mount out, and spend another $300odd and get a FMIC, when he should have just bought one in the first place.
Honestly, with prices of FMIC kits now, why would you bother with a side mount?