You can take the spindle from the throttle cable off of a Civic TB, replace your cable with an ITR cable (civic cable might work) and completely remove the bracket for the GSR cable. This flips the way that the throttle cable turns the throttle body. You will also need the throttle cable bracket for the intake manifold to secure/adjust the cable. I did this with my skunk2 manifold because the bracket was hitting my hood.

From the Online Resources section: http://www.ff-squad.com/tech/howto/sk2manifold/