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My mechanical engineer friend had a cracked exhaust manifold on his 4-cyl 2.7L taco, which in Virginia means you to fail inspection.
He has fuel economy logs going back to 2005 for this truck.
New dealer part was something like $800, a used one off the internet was $500. A pacesetter 4 into 1 header was $400.
He put the pacesetter header on in 2010 and it is still going good.
He says the header appears to have not hurt fuel economy at all, but is half the weight of the cast iron manifold and has increased low end torque and high end get up all around.
For the metro header, if were going to build one I would use 1'' diameter 0.62'' wall 304 stainless. Not sure how long the tubes would be.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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