d-series arnt that bad. staged clutch is a plus but i wouldnt agree with the stage unless i took a look for myself. nitrous for cheap fast power and turbo is for the fun pulls. i would invest for some arp head studs and main bolts. my old d15b7 stock bottem end with y8 head gasket and arp head studs was doing pretty good at 12psi on t3/t4 ebay turbo.
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