Oh, and the Nismo cat-back, assuming you mean off of a Nismo 370, and not one of their 'S-Tune' or whatever exhausts, is good for another 10-15 WHP.
If you can get one cheap (Sub $500) then you're getting the best bang for buck, by far.
Just that exhaust + drop ins will get you close to 295whp on most Dynojets, after the car has had some time to run in the learned fuel data.
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