are you asking about a multi-vial or an amp?? I haven't heard of tren amps... so I'm guessing you mean a multi-vial... which is most likely to be either 10 or 20 mls per vial.... if it says 100 mg per 2 mls then yes you would need 4 injections of 2 mls each to reach 400 pw.
weighted dips 67 kgs 3 solid reps
deadlift 220kgs 1
shoulder shrug 320kgs 3
leg press 593kgs 3-4
body weight 82kgs