i see si's and their tail lights when turned on the lights are fatter.. ??

 

i don't think so, the 90-91 model has a darken outside sur-round line
88-89 don't.

 

i saw my friends all stock 91 crx si and yea the lights glow fatter.. and i have a 91 hf mine glow skinnier..

 

pics? Im not sure what you mean by "glowing fatter"...

 

bleh mine glows like slightly inside.. like this |||||||| ||||||||

but the si my friend has glows like this ||||||||| |||||||||
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um, my 88 dx and my 91 si are the exact same.both original,its prolly the bulbs.