I do my own installation of parts on my ~Z~ ... I only paid for the dyno-tuning & using premium parts/ 5,000 is a ballpark on 340ish whp. W/pump 93...& probably another 1-1500 to squeak out that other 10.
Please factor in a traction unit for your differential, as you will have issues with grip & the open diff is unsafe & can have you doing unexpected lane changes if you're staying in the throttle under wheel spin.
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