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Looking for some more power

Text item: Text_1

     Anyone have any ideas in engine upgrades for the 4000q?
     I've noticed that TAP has an larger throttle body available, anyone 
     have any experience with this upgrade?
     How about getting a K&N air filter?  Pro's or con's to this idea?
     Any other suggestions?
     PS My around gas mileage seems to be around 20MPG, that seems a little 
     low to me.  Any ideas what might be causing this, things to check?