even with quality parts, minus a brand new turbo (this is what will rape you), you can build kits for under $700 all day long without tuning.
the best "tuning" route is definitely:
weight redox (free)
brake pads (cheap)
suspension ($500+)
turbo ($1000 said done)
the best "tuning" route is definitely:
weight redox (free)
brake pads (cheap)
suspension ($500+)
turbo ($1000 said done)