I have a 94 JDM GSR with a Skunk2 Intake Manifold and a generic short ram air intake in my 92 Civic CX Hatchback. I have drove my car running straight header with NO exhaust and then i drive it now with my stock 1.5 or 1.75" exhaust and i feel a pretty big power loss, my question is how much hp do you think im losing due to having a completly stock exhaust? Also what size piping do you think i should go with when i get it all re-done?(P.S. I plan on forced induction in a couple years) THANKS!!!