Sometimes running cast iron LS exhaust manifolds are the way to go. Most of the time that’s simply due to clearance issues in whatever vehicle you swapped an LS into.
Cast iron manifolds tend to get a bad reputation for making less horsepower than headers. Most of the time that is true, but in our experience they only drop peak power by about three-percent.
Now, we aren’t claiming CPP's fancy LS manifolds (PN: CPLS-EHSCA) are as “cool” as long tubes. But, we’ve got reason to believe they still make good power and have plenty of other redeeming qualities. Just check out the dyno graph below.
Cast iron manifolds tend to get a bad reputation for making less horsepower than headers. Most of the time that is true, but in our experience they only drop peak power by about three-percent.
Now, we aren’t claiming CPP's fancy LS manifolds (PN: CPLS-EHSCA) are as “cool” as long tubes. But, we’ve got reason to believe they still make good power and have plenty of other redeeming qualities. Just check out the dyno graph below.