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275max will work, some places might not do it, you will probably have some side wall flex but overall you will be fine. You looking to go wider for a d/r for track or what ?
275 on an 8" is acceptable, though, WILL look stretched and may impact handling... 315 on a 9"...? No way. I've got a 295 on a 10" wheel and it's perfectly aligned, I wouldn't go wider than 305... 315 on 10" is even a stretch.
Stock wheels are 8", stock tires are 245, so that is safe. You could do 255/265 without it being too horrible, though I personally wouldn't go that high.