I myself like the OEM Velocity Stacks which the 4040's I had did not have molded into them other then that they are a pretty good filter.
 
Mine was first dynoed ( after going Carpenter) with the smaller 2780 filters on. I now have the 4040's ,which look a lot cooler! However the bigger filters made squat difference on the dyno. 2780's will flow enough to hit 240HP, will they go higher? mebbe.
 
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