I'm looking at getting a supersprint exhaust. Downside being it takes forever to get it in. Upside is it looks like stock, weighs less, has some gains, and isn't obnoxiously loud.

 

i think 70s are good if your going all out(trying to get all you can hp wise no matter what it takes, money tickets etc etc). For dd id stick to something alittle more quiet like the 63mm but the limited edition 70mm T1R from evasive i heard is pretty quiet, it reminds me of a magnaflow oval with a turn down for 1000 bucks!!! but it is a very nice exhaust just dont see where the money went into making that one!