Holy Crap i just did this.... used 220uf capacitors from radio shack...... many pros and few cons. Mids and highs are improved(since its not muffled from the door rattling and each speaker is handling a specific frequency). bass from rear subs are louder than one would have thought. Sounds similar to a decently sounding/designed 8 inch powered sub. it does help tha i have an aftermarket Clarion receiver which has more power than the stock unit and has different level of bass EQ. I would DEF recommend this if you have an aftermarket receiver. The only real con is that the 220 capacitors take off a bit too much bass from the door speakers. i will get some 330uf and that should solve and improve sound quality. Oh yea another con is since theres a lack of 100hz-150ish hz bass, the music isnt as loud while driving. (bass isnt as boomy and punchy). Overall well worth mod that can be tuned to everyones liking.