If you want an exhaust that sounds amazing when you stamp the loud pedal, but civilised the rest of the time, its definately the Nismo you want.
Boomy on the motorway??? I dont know what your on about, on the motorway at a steady speed you cant hear the nismo at all IMO.
Only time i hear it, is under hard acceleration, and it makes a fantastic noise then!
IMO the Nismo is too quiet, i've got a 5Zigen exhaust to go on when the weather picks up, then ill flog my nismo i expect.