Besides the smelling and fuming factor, Nismo Exhaust gets LOUD with TP.
I used to have the same setup and it was just too loud for me lol
If you have Nismo Exhaust, I say HFC all the way; no smell, not as loud, everyone's happy
When I had Crawford HFC, my car sounded absolutely sick!
Just make sure you get different Y-pipe to keep the HFC from cracking haha..

 

test pipes+ buddyclub exhaust is bad too, if i take out the silncers it sounds the same as it does with no muffler