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Thats why I went with 1 5/8 equal length headers. They almost perform a s well as Long tube headers for a fraction of the price.
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I don't believe they have equal length shorties for 351W swaps. If you know of any, I'd love to upgrade.
I'm kind of at the same place that Stang_ROTY is. I've got about 345 rwhp/375ft-lbs of torque and am trying to figure out how to bump it up some. I currently have a 70mm TB and am thinking of getting a 75mm. Long tubes would be nice, but probably too loud for everyday use and PKRWUD tells me that speed bumps are a pain. My car is lowered, too, so I can only imagine how bad it would get.
If you're pulling the engine, you may be better off getting your intake and heads extrude honed.