We run 2.125 TTI headers 1230 hp 5.0 on 26's at 142 mph NA 173 @ 8.0 1/4. 565 inches, 9300 rpm going thru the traps in the quarter. Wow! That's bookin'! I think this answers the header question... True dat.......wondering if it's can benefit from a bigger header?   My thoughts exactly. It is crazy fast, but has it ever been tested w/ a bigger header? I don't think I've ever seen an engine making that kind of power w/ that small a header on it. IMO the OP's car is just fine w/ the 2 1/8" header and likely would see no improvement w/ a 2 1/4". The mufflers he's running are the restriction.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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