A friend of mine got a quote to put exhaust on his truck. From the manifolds, 2 highflow cats, 2 glasspacks with dual 3' tips. All new tubing in SS with good bends and such. He was quoted $450 for all of this plus install. Does this sound like a decent price? It is a 97 ext. cab F150 with a 4.6 if that makes a diff.