What would be the best upgrade for a 98 C43? I love the car just would like to have a little bit more kick to it. Any advice would be appreciated. Thanks

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94 E500 Sport
SOLD:
2002 BMW M3 Coupe 6 Speed.
SOLD:
92 500E Black Pearl, Black.
18" 2 Piece AMG
ASR Defeat
Performance Chip
Crossed Drilled Rotors.