A 455 in a Chevy LUV and an S-10??? That is a bit of over-kill there....my kind of people! I knew I would like this forum! As far as the headers, the info I saw said that it would be best to use the stock manifolds off of a w-30 car due to running the true duels. It said that it would be 10-15 hp less, but even without those ponies, I am still gonna have traction issues....though it's the kind of "issues" I think I can live with. I'm not gonna lie, I'm not looking for a track car. I just want a nice cruiser that I can have some fun with. Stock it is 350 hp and 500 lbs.