[briang0901]

Dependent on the header design you will more than likely throw a CEL code which is why most companies recommend you tune your car after install. EL usually provides more power than a UEL but you lose the boxer rumble. I ran my Nameless EL headers vs a friend with Borla UEL headers. I pulled him in 2nd and 3rd, he pulled me in 4th. The gains wont be too significantly apart from each other so its basically going to come down to preference. Hope that helps.