I suspect the only reason not to fit a more free flow pipe from the start is not in the engine but the rider. Throaty exhaust notes make it harder to stick to a conservative break in schedule ![Grin ;D](https://forum.classicmotorworks.com/Smileys/default/grin.gif)
Scott
Well, at 45 degrees in still air, somewhat colder at 60mph, it is clear that the air-cooled UCE motor likes the temperature more than my body does!
Anyway, I put 30 cold miles on the C5 today and I really like the exhaust tone from the upswept muffler. Who cares if the MPG dips a bit if the bike sounds that good?!
The motor feels like it is more willing to rev, and it also pulls harder under some load (but not too much just yet).
Oh, at 60mpg (66 on the dial) the C5 felt stable. No groovy pavement this time. Since the indicated limit was 50 I didn't go any faster, this day.
![Grin ;D](https://forum.classicmotorworks.com/Smileys/default/grin.gif)