Yo I'm new and hope I'm not doin it wrong. I've searched and searched so I think I'm in the clear!

I have a B18a1 in a 1989 civic wagon. Bolt ons are an AEM cold air intake, 4-1 DC Sport header, 2.5 exhaust with a couple resonators, hasport motor mounts, larger gauge plug wired, and an alternator pully. The bottom end is rebuilt stock. The head has stage 2 crower cams, AEM adjustable cam gears, crower titanium valve springs, aftermarket valves but I really can't remember what they are, the head is ported and polished, and the intake manifold is match ported. And when I did the swap I wired in some saturated injectors. I have a machined lightened flywheel with a stage 2 exedy clutch. Also the ecu is chipped. It dyno tuned at 149whp.

Question is! Would I gain anything with this setup to change my intake manifold and TB or should I just stay here.

 

At 149 wheel HP, you might gain a couple of HP by switching to a slightly larger throttle body... say a 62mm from a GSR. Bigger than this will not increase HP but will lose mid-range performance. The intake manifold might pick up a few ponies up top as well... at the expense of mid-range power again. You choose.

 

Rad, thanks! That's what I was thinking after I got it tuned last. Can't remember what TB I was looking into but was thinking that since my manifold was port matched I should probably just leave it alone. I've also been curious in the past about fuel rails but I've never gotten a clear answer since most people have completely different setups than I do. Feel like Honda already does such a good job that usually things like that and ignition systems should just be left alone unless nos or boost.