by XHfalcon » August 11th, 2010, 12:03 pm
A quick search would have answered this has been covered before
but from what i understand the Competition series use a different primary pipe design to increase power more at the top of the rev range
hope this helps
EF xr6, Precision 75mm turbo, 6boost, Plazmaman Plenum, Wolf V550, C4, JE pistons....ETA on skids 6 weeks