Hey gang whats folks doing for exhaust in their ls4 swaps. Is there a cerian oem manifold that works well. Im gathering my parts and other than radiator im ready.
I have low low mileage ls but just the manifolds. i dont wanna reinvent wheel if i can just find something that will work. I am kinda old school and would rather run two mufflers (small ones)
or maybe 2 cats and no mufflers at all..i want loud but liveable.
If anyone has input and or even pics..its appreciated. TYSM

I know this post is old, but I too am interested in this answer. I do not want to use the stock LS4 'over the transmission' crossover pipe and want to go under the cradle. Watching for responses......

LS7 manifolds are popular.

quote Originally posted by Spadesluck: LS7 manifolds are popular.

only if your using a manual. LS7 mani's will not clear the Auto trans. I have tried truck mani's, LS1 and GTO, nothing will clear the auto trans. With the truck mani's you could have the end cut off and new one welded on at a better angle, but if you want stock mani's you're stuck w/ the LS4 or the LS4 headers made for the Monte Carlo, GP and Impala SS.

Good to point that out, thank you. For me I just assume folks are going to run a manual with the LS4. Ha