it will effect ur fuel consumption a little bit laa.. not to say it wont affect at all, it will all depend on ur setup and the design of the muffler and bullet.. dont bother bout the FC if u r hunting for power.. ur heavy foot will contribute more effect than the exhaust system..
It hasn’t been that long really but the engineers at Nissan already have a round of improvements in store for next year’s 370Z as well as for the Nismo version...