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FWIW, my 2.3L TVS on my 2011 5.4L GT500 makes 17 lbs of boost, it's my daily driver, it's been absolutely trouble-free, and dyno'd at 660 rwhp.
It is true that there are more gains available with the 5.4, because stock they are so under-utilized. BUT, there's certainly another few pounds of reliable boost available in the 5.8, along with a tune and details, 700 rwhp should be EASILY ATTAINABLE for a total investment of around $1,000 in doo-dads and tune.
Not to mention it's tugging around 300 lbs less flab.
There's just no "catching up" to that car with the ZL1 unless you pull out your check-book, wad up your warranty, change cam, headers, exhaust, pulley, maybe blower too, tune, etc.etc...
I'm sure you can get there, but with a louder lopey-er more-cantankerous beast, which is fun for weekend-dorking-around, but stinks for day-in-day-out.
Just being real.
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