I have read all the post about Brian's car and the EDL piggyback addition. Brian or Greg can correct me and it will not hurt my feelings at all. It appears Brian's testing was done with his full exhaust in place. That exhaust system already produced a little over 200 ft-lbs and 160 hp on the dyno. And those numbers could have been low due to the ECU pulling power up at the top end due to the front wheels not spinning. Those are outstanding gains for an exhaust. Obviously a tremendous amount of restriction in that crossover pipe. Now there is only so much hp/torque to be gained from flow through this motor. You can either increase that flow by pushing harder(more boost like the EDL) or less restriction (GWR full exhaust). Once maxed out there is no more. I believe that the EDL did not produce the advertised gains on Brian's full exhaust car because it was already close to max flow with his exhaust in place. Which will most likely mean that I will not see Brian's advertised exhaust gains if I am already running an EDL piggyback. This is just my take after reading all the threads.