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From looking at your profile, I'd say 455 is damn good for what you have. Don't expect turbos to cure everything. I don't see cams, or any porting work, pulley, or flywheel in your profile. After that, get an SAFC & get on a dyno w/ wideband O2 & tune the crap out of it... there's a lot of buried potential in there. If you expect 680HP out of those turbos right now... it ain't even close to happening because that doesn't just come in the form of bolt ons w/ the Z. The 555s will probably max out their duty cycle before you get to 680 anyway. I wouldn't cuss the turbos just yet. Carlos is right.. you need drag radials w/ that much HP.I'm just a stage III+ & I've gotten up to 13.304 @ 114.64mph on streets.. if I had radials I could be in the mid 12s w/ that trapspeed. If you were on radials... yeah.. high 11s
Later
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