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The Schumacher headers are what I'm going to use for my car, just a puny 400+.030. This test helped convince me that I'd probably never notice the difference. Andy F made 550hp with 470" a mp.528 cam and stock HP manifolds 
I have that magazine test mule motor Andy built in my car. He had upgraded the cam to a bigger Comp grind. I downgraded back to the 528. What a great cam (gave Andy the Comp cam back). I have TTI's on my Challenger and am going back to manifolds with big headpipes. Headers are a pain cause even the TTI's rust and look like crap. IF someone made SS headers I'd be all over that but I don't have the time or $ to have a custom set made. I'd even go for some SS shorties
for the price schumacher and TTI charge, they should be at least 409 stainless.....304 stainless polishes up nice, but has it's own issues when used in headers. it'll thermal fatigue and crack. my boss had that issue on 2 pair of headers on his 454 truck....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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