I'm making really long headers for small engines such as my lawn mower and stump grinder and it's definitely working.
It's not saving any fuel in the existing engine but on my stump grinder the straight pipe has given a nice little power boost making it so I don't replace the Honda gx390 with a predator 670cc V-twin.
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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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