Performance loss from headers to HP manifolds

Rick 5150 69 said
I think you`ll notice your low end torgue will improve, the upper mid range, and top end rpm will suffer, if your not racing you`ll probably not notice, I have fixed my kids twice now, by drilling a hole and using a dent puller, and plug weld the hole and by cutting and replacing sections, easier than pulling and replacing... for now anyways..

Long tube (under chassis) headers tend to improve the low end power so you will notice a loss through out the rpm range.