Subaru has major plans for the next iteration of its cult classic WRX and its more extreme WRX STI variant, and this time the cars won’t be derived from any econo compact car platform according to the latest reports.

Earlier this year we reported that the next-gen WRX and WRX STI would be dropping the Impreza title from their names to further differentiate them from the regular family-oriented vehicle.

Now Automotive News (subscription required) is reporting that the new performance models, due in 2013, will also sport unique platforms.  

According to information revealed by senior vice president of sales for Subaru of America, Bill Cyphers, the new WRX and WRX STI would be moving more upscale to better reflect their price hike over the regular Impreza, with unique engines, interiors, and features all used to differentiate them.  

Cyphers also said that the WRX STI would develop at least 300 horsepower.

A previous source said the cars would use a radically modified and significantly shortened version of the Impreza’s platform, though we could envisage an all-wheel drive version of the upcoming BRZ’s platform even being adopted.