79 rx7-I have bridgeported TII end housings lapped and nitrated, cermet coated housings race ported, S5 N/A rotors cermet coated, Full racing beat exhaust, TII lower intake manifold. I'm just wondering what upper intake manifold would be best for a N/A 13b with this combo. I'm think a FD upper because it has a bigger throttle body and the intake has no plenum, which makes me think a better less turbulent air flow or does the plenum make a less turbulent airflow lol. The 6 port upper intake manifold looks like it would be the worst because it bends so much before it goes to the lower manifold. I dont care about low end torque, just wondering what intake would give me the best peak HP numbers. Appreciate it guys.
John Paul Caruana

 

FD upper would be bigger,flow better.
TII upper would be simpler,no adaptor/porting.

Either should flow more than adequately for N/A and both are still pulse tuned,although not as extensively as the N/A intakes.....

 

I've seen reports that they perform poorly in n/a applications. How bout an IDA style throttle body? That would definately be more productive for top end.

 

From what I have seen in the 2nd gen section. A s4 t2 LIM, port matched to a FD UIM is the best combo. But this is just what I have read, and it is also the setup ddub ran on his NA fc and it seemed to run awsome.