You're contradicting yourself. You say you don't care about top end, and yet you want to run faster in the quarter mile. To answer your question, no, an OEM manifold will not yield faster quarter mile times. If anything, switch to a 4-2-1 header if you need more torque than you're getting with a 4-1, but looking for torque in a 4cyl Honda is somewhat of a lost cause. By all means, do not switch to an OEM manifold, they're way too constrictive.