My Cuda in full "Street" trim, goes 9.89 at 134mph....I run Hooker headers 2.25 tubes to 3.5" collectors shrunk down to 3" exhaust and 3" flow masters....No x pipe....
60ft is a 1.33 so far....on DOT "tires"...
Take the mufflers and exhaust off and open it to 3.5" wide open....Same ET. That is surprising. Mine doesn't seem to like mufflers...atleast not much of one. Runs best w/ 4" race Bullets right off the collectors. My headers have 4" collectors though. Open headers runs about the same, but the 60 foot is slightly softer. My H pipe system is really heavy though, so I'm sure part of the gain is from weight loss.
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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