I think it made the car more responsive (the fast spool) but that's the butt dyno talking, so who knows for sure.
If you put on an open exhaust like a SaabSport, it will definitely have a nice growl. Mine has a Magnaflow resonator on the V2 part of the pipe to quiet it down to "loud only when you step on it". If I'm gentle, it's tame and just sporty sounding. I mention this point because that might be why it seems more responsive. Again, Butt Dyno.
FYI... saw some posts on shipping from China: Standard shipping (which is in a container with tons of other stuff) takes at least two months now. Used to be quick- no more.
I tracked my last shipment... talked to the vendor... it took forever just to get out of China. Once it got to the USA, it sat in LA for at least a couple weeks before being sent the final leg. Express Shipping (DHL) is still fast... a few days to a week. You need to ask when you order now.