my 10" Type R was overpowering my factory speakers. That's when I decided to get new speakers all around, 4ch amp and a deck. Sound quality is way better with the new deck then the stock bose crap. If you're looking to integrate... I've heard very good things about JL CleanSweep processor.

But with the stock radio and LOC the bass will not sound very good.

Find out if the RX8 has RCA pre-outs on the back of the factory head unit. if you got them then you'll be able to get a good clean signal.