Originally Posted by
XCELR8
DOHC what? Marauder? I'd probably start with a big intake, like a JLT or something. After that, substituting the 'X/H' pipe with something larger, mandrel bent and high flow cats would be a really good start too. Follow that with a cat-back of the same diameter and mandrel bent. If it's a Marauder, you'll probably need a tune as well, as you'll be a little on the lean side after that.