large tube runner

i was wondering if the large tube runners with bolt up to the stock plenum or do you need a different plenum? and are the any suprises i need to worry about?

ttt

runners should bolt right up and from my understanding make on heck of a difference

They bolt up but I'd recommend port matching the plenum to the runner. Otherwise you're goin to lose some efficiency to the turbulence caused by the difference in the opening size on the plenum flange and the one on the runner...

what brand of runners did you use???

TheGreatJ is right on the money