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I guess it depends on what you have on it, if it's NAWS and such then probably yes, with decals you can be over the top, they can compliment your car, all i have is a lexstasy.com sticker that spans across my windshield and a autocouture decal on the back.
I think a few small decals are not bad. I have 2 CL stickers on mine and that is it. Plus they are the same color as my car. But I think more than a few is overboard, unless of course you are sponsored.