I use my '90 pickup to commute down to town each day, and the drive involves a 5-7% grade several miles long. The truck is high geared, which makes for great gas mileage, but doesn't help much when climbing the hill. It's also carbureted, which means it has less power to begin with. I suppose I could downshift, but but the engine really has to wind up to reach even 50 mph in third (It's a 4-speed). I have been looking at my tiny exhaust pipe and thinking that it probably is not helping anything to have such small exhaust. I checked into getting dual exhaust but the guy at the muffler shop told me that the 22R needs a certain amount of backpressure to run properly and so I shouldn't attempt to increase the exhaust flow. Is this true? Could I get away with running a bit larger pipe and perhaps a less restrictive muffler and still give the engine the backpressure it needs (if it needs it)? Or should I just drop it in third and let the engine scream away and hope that Japanese engines really do have a high redline?