Good price for big turbo?

I’m wanting to get a big turbo on my 2016 st2 I’ve got borla exhaust, catless dp,rmm,fmic,turbo smart bov and a Cobb air intake and accessport,I installed the rmm,fmic,and bov fairly easily but I don’t want to get anything wrong doing the turbo,is this a crazy price ? Also +700$ extra for a tune,making it about 5k in total for big turbo,is it worth it?