Fun yes and it keeps me off the patrolled streets some.
My attitude is that friction is additive and any reduction here helps overall there. Please see my wye was two elbows that were sectioned and have internal wall surfaces the blend into a common port, ie smooth transition.

Woody on a three day weekend...............

BTW I metered the force of the air at the front of my car yesterdat at a legal speed of 45 mph and saw about 1 inch of water column of ram air pressure due to the forward motion of the car, not enough to get wiggy about with horns and such facing front.........FYI