the 318s rarely have an amp. If you do, it will be in said location. You can by looking at you door panel. If you have two speakers in each door, you have an amp. if you have just a tweet, you dont.
<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>