The combo will work fine, so long as you size the tires properly. You'll want to keep the overall outside tire diameter the same as stock though. The wall profile for the 20's will obviously be half an inch shorter than the 19's. You could be limited to tire choices if you go with 20's however.
Personally, I think 18" or 19" is as far as I would go..... but thats just me. 20's are more for show, rather than performance benefits. 18's are the sweet spot for performance and tire size options while 19's sacrifice a tiny bit for an inch more wheel.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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