I'm looking for the exact same thing for my 2004 GT2. Let me know if you find one and costs if you would be so kind and I'll do the same.
EDIT::
Ran across a few, but are on ebay, an eg of one item# 2300995652994
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Grand Prix GT2 2004
ZZP Z7 Turbo Kit 62-1, BC, 42.5# Injectors, LT1 MAF, 160 tstat, A/A IC, BOV, 3" ZZP SS Exhaust /w cutout, GMPP Handling kit
339.2 WHP 358.6 WTQ @ 13 PSI (zzp's mustang dyno)