Having jumped from a GP17 Ducati last season to the very latest GP19 this season, Pramac's Jack Miller is in no doubt about the most significant difference.
"The big thing between my legs - the engine!" he quipped. "It's a lot better.
"The rest is a lot of different things; it's an improvement, two years newer, it's better on the tyres.
"But definitely the engine."
Sitting across from good friend Alex Rins at COTA on Thursday, the Australian triggered more chuckles when he said:
"The bike works good everywhere. I can't complain too much… I feel great on the straight, especially when there is a Suzuki in front of me!"
Miller's fourth place in Argentina marked his best finish since May last year.
