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Thanks forzda I haven't have time to get my truck on the lift and check everything out under it yet so I have no clue how it looks.   Your probably right that it doesn't restrict as much airflow, but I think with a tune and higher boost  if changing to none catted it would definitely add more power than with a stock tune, the question stands though how many.. Im surprised vendors aren't doing this to sell their product and showing results for them, or like you said it may be small numbers under 10hp that you will never feel.