There are many factors making your system sound "pants"
Firstly, are you still running an RCD300/500 radio? If so replace that with an RCD310/510 or after market radio first.
Then report back.
Otherwise installing Focal A163.2 (or something like that) or better yet Hertz HSK 163.4 are a great upgrade. You have to sound deaden the doors properly and ideally install at least a 50-80wrms amplifier for the speakers. It a completely different sound then.
A few years ago, I actually fed approx 80-120wrms into my factory speakers and the RCD310 was then fed to a JBL MS-8 into the amplifier back into the speakers.
This system sounded really good. Had it running like that for the better part of 10 months till I sold the car.