exshaust questions

[pandrade]

hey every one im gussing this is one of the first thing people do to there supra and thats an exshaust. currently my whole exhaust is 3in from including test pipe and the whole system. i have no cats or mufflers except a small megan raceing canister at the end whith goes from 3in to 4in( doesent look to ricey).

my problem is that i love the performence i have gained but there is quite a bit of drone noise especialy at cruze speeds( for me usualy 2,500) if at idle or above cruze it sounds wounderfull. i was thinking of glass packing the main section to help whith noise( great option for me since its about 20$ at my advanced) my thought is i dont want to lose performance i have now for a little noise cancelation, and this graph shows how much i would lose from my current 3in to a glass pack 3 in http://www.cherrybomb.com/Uploads/images/flowrates.jpg

and also i want it quieter and i am thinking of buying the vortex since it offers the best performance and muffles the noise quite a bit compared to the glass pack
http://www.cherrybomb.com/Uploads/images/soundchart.jpg

any thoughts?