I got an old nitro sport that I am rebuilding into the new style sport. I went threw and cleaned it all up and have finally got it running but it still needs some tuning. I had issues keeping it running the other day but it was wet out so I think that may have been an issue. I cant get it running full speed either it seems very sluggish. I am getting new bearings for all of the wheels this week to see if that helps at all. I also have a bid on new tires and wheels as well as new body. I am excited to bring this thing back from the dead. Are the tuned aluminum TRX exhausts worth the money or should I keep it stock? Any other good cheap upgrades for speed? I want this to be more of a street ride but I am getting some knobby tires for a a little dirt action because it has some street tires on it now.