Old Head, try my spring mod, it will help you hold boost to redline.
Its on my site.
http://www.exhaustdepot.net/edwaspmod.html
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E.D. 3\" Turbo Back, , HKS SSBOV, GReddy-e01 Boost controller, Greddy E-manage fuel management, Blitz Turbo Timer, JE pistons, Ported Head, E.D. Large Frontmount Intercooler, E.D. Tubular manifold with t3/t4 (prototype), IPP coilovers, Limited Slip.
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