I need some advice from people.
I use to have a 90 civic si. The only mod in it was an intake.
I noticed some top end gain in power but when I removed the intake and put back the stock air box, I noticed the low end was a lot stronger than with the intake.

Is this normal? I know that an exhaust will solve this problem however I only want to get an intake for my car.

What to you guys/girls think?