You could try BMC Race to have a custom one made like mine. As far as n/a goes i know there are couple n/a b series and h series motors using their manifolds and making good power. James at BMC race designs the intakes and runners for both turbo and n/a use and determines runner length by what size motor and what powerband your looking at.
Only issue with our setups is our clearance to the firewall. Hondas have soo much more room between the motor and firewall for longer runner intake manifolds. The intake runners on my turbo manifold are about 6" long from the flange to the top of the velocity stacks. His velocity stack and runner design have already proven to make awesome power both n/a and turbo. Might be worth a shot trying one in n/a form. Excessive manifolds didnt really make a whole lot of power from what we have seen. Barely any more than a stock one.
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1992 Nissan Sentra SE-R - Fully Built SR20VE, BWS400SX Billet 67mm and much more
JMS Racing tuned to 716whp, 423wtq at 29psi
10.5 @ 149.2mph to date I believe the fastest trap speed SE-R, Much more to come with some changes!
I have found N1 intake manifolds make alittle WHP NA but they have to be ported. If you get a N1 manifold and dont port it it will make less WHP than stock VE manifold. The N1 manifold was made and designed to be ported and comes that way on the factory car.
Check iut my engine on gre v thread of the xceesive plenum with n1 ,runners its 11hp more and 4 tq I think and custom ive seen two ofthem only make 7 and other 6 some for me xcessive the best good luck