yellow springs with boost
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I used them on my old 2500hd crew 4wd with bone stock 6.0 and 70mm front mount, up to 12psi with no issues. Of course I never took that motor over 5800 and 12 psi was a rare occurance.
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I've got the yellows on my T76 5.3 build...havn't had it tuned yet but I've heard good things about the LS6 springs with boost. One of the chevy car mags just did a 76mm 5.3 build with the LS6 springs and made 594 HP at 12 PSI with no problems.