I think the OEM manifolds are a very nice part made with good materials. Its a shame to discard IMO.. Also a set of headers cost $1200 to $1500 I can make cat delete pipes and offer them for 1/4 the price. Will be a easier install as well. Im not looking for any power gains, just want some fire and noise from the exhaust and a simple swap when I trade the car or go for emissions test, warranty ext..