The tip is only a look thing.
The muffler will determine the sound and if a straight through system add performance. Straight through mufflers like the N1 exhausts are extrememly loud and will attract attention of the cops.
Best performance in regards to an airfilter is not to have one. Different airfilters for different purposes is bs. The less restrictive the better, and if you don't want to lag, rev more on takeoff.