I'm already aware of the fact that s2000 isn't the most mod-friendly car in the world, nor is it the fastest one either, but I was just wondering. About how much increase in hp, 1/4 mile time, and torque would i expect with the top of the line I/E/H for the s2k?

 

Not worth doing I/E/H if you are looking at how much more hp you will gain.
u will gain like 10-15hp at peak for $2500-4000.(oh u will lose good amount of power at low end too)

But I will still do I/E/H because my car deserve nice set of Ti header/exhaust and carbon fiber intake and its sound
I'm not even expecting any noticable hp gain.

 

it will sound great, but dont expect ground-shaking gains