While we've never figured out why Syl even ventured to Mexico alone in the first place, all he ended up doing was swapping one adversary, Tweety, for another in Speedy. In "The Pied Piper of Guadalupe", Syl takes flute lessons in order to get even with the local mice who've been taunting him, since he is, after all, one of the worst when it comes to catching mice, or didn't he learn anything from those cases of mistaken identity with Hippety Hopper?
Mel Blanc even uses the engine voice he created for Jack Benny's Maxwell, which would later be recycled for Speed Buggy, albeit with dialogue added, in this piece.
I think WB missed the boat when they didn't include an analogue for Speedy in 2005's Loonatics Unleashed. After all, he'd be perfect as the Loonatics' other answer to the Flash, aside from Rev Runner.