The HM Headers extractors and 2.5" system adds about 9% power i think. I am looking at getting a set for my ea. They claimed that i would get about a 15 rwkw gain. I got a quote of about $1500 fitted from an exhaust shop and about $1000 or so from ford not fitted. The extractors are stainless so i think it's good value for money. I'll let everyone know when i have them fited the difference it makes.......
EA Fairmont Ghia : 3.9L MPFI, 2.5" cat back sports exhaust, K&N panel filter. Pioneer head unit, pioneer 4" three way fronts, Pioneer 6" 3 way rears, 2x 12" subs, blue interior light.
My main pride and joy : '76 XB Fairmont GS, 250CI, 140,000 Km and all stock.... for now! (Factory air-con on the way)