I added the BSW Stage 1 and their X108 Sub woofer to my non-dsp system and I like the results a-lot. Plus you don't lose your factory look or the on board computer functions. But that's going to be a $1,200 hit if you do both. I went all directions on this and stuck with my stock system and for me, it's great. Good luck on which ever direction you choose! (and getting a audio shop opinion isn't bad advice either; get all the info so you can make the most informed decision)