cobain... I've never had either one dyno'd. I'm aiming to hit the dyno with the gt very soon. I'm in the neighborhood of 275 hp at the wheels for the gt. I don't even have a clue what the fastback may be putting out.
As far as your question about the headers. The car already had the headers on before we had it. So I can't tell you what the gain might be. Sorry man
Beautiful cars man, you should be proud. I notice steeda equipment on the gt. Do you have any of the g-trac suspension kits on there? My friend has stage 1,2,3 and his car is rock solid. A 20 mph turn in a regular car is a 60mph for him, the car is stuck to the ground. As far as I'm concerned, for late model suspension, roush and saleen can bite it.
thanx mrbobmarley... I don't have any of the Gtrac kits. I'm setting it up for drag race only. Steeda has the drag pack suspension but I'll prolly stick with my lowering springs. I will however get lca's, and get a tubular k and a arms. But if your into auto-x'ing i'd go with the g trac with no second thoughts. Suspesion is what Steeda does best