You will certainly notice the change. You won't be getting as clean of a signal to the speakers as an aftermarket amp, but the stock should do fine until you upgrade.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>