Hmmm... the Aveo is actually a Daewoo, so if there are any performance parts available in Korea, it might be possible to import them.
Unfortunately, it's not a popular car in the US, so tuner parts might be hard to find (yung Protege nga, medyo common, ang hirap din ng parts!).
While I've been impressed by the interior quality and build quality of the Optra, there are still things on the Aveo that seem cheap compared to other makes.
Sure, the plastic isn't any worse than the plastic on the Koreans (in some parts, a bit better), but there are fitment issues on the showroom models I saw at the Chevy event at Eastwood...
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As a disclaimer, unlike Psylocke, who's very picky with regards to interior panel fitment (bwahahaha!!! just ribbing, dude), I've never really paid attention to such things (heck, I only notice them on my cars after years of driving...)... but two or three things stood out from my inspection of the Aveo...

Here's the uneven trim on the instrument binnacle.

And here's a funny one... the plastic trim between the hood, quarter panel and windscreen... on two different cars, none of the edges lined up the same way... with a difference of as much as one centimeter left-right on the same car...
But in the end, the Aveo is a decent little car... just a little old looking (in the case of the hatch) and a bit simple for the price (in the case of the sedan) compared to the Korean and Japanese competition.