There might be one if there is an identical model but differently spec'd that comes with an i7, if there isn't then no... Most laptops have their hardware made to match the case (or the other way around).
Also, changing ANYTHING in a laptop is a major pain, you are just better off spending some money on a half decent desktop; even if it is spec'd "lower" - laptop parts are vastly inferior to their desktop equivalents.
Hope I helped