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I installed my 4-2-1 about a week ago. They went it very smoothly. There was no interference anywhere. In fact the 4-2-1 fit better than the JDL UEL header they replaced. Power wise they have a smoother torque cure than the UEL but I shouldn't really comment as I am just on the Delicious base map. Once the tune is finalised I'll have some better driving feel comparisons.
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