i'm planning on getting a pair of Infinity Kappa 63.5i speakers for my 97 es 300 the rms on the speaker is at 75 rms i know for sure that the stock amp won't pull this but will it still sound ok or decent? i don't wanna buy another amp to pull it either not yet at least ^_^

 

I can't answer your question specifically, but I can tell you that I just replaced the stock Pioneer speakers in my 98 GS400 with a set of Boston Acoustics SL60 6.5 inch speakers. They sound fine, but definitely not a 10/10. I would say that they are slightly better than the stock ones. I am using the stock amp.