Here's what one guy did to his 240:
These are items I replaced or added during the 10 years I owned my 240, estimated by price:
2 Headlight Inserts $128/ea 2 Taillight Assemblies (OEM) $124/ea 1 iPD Hi-Flow Exhaust $121 1 Tail Lamp Decor Panel (OEM) $100 1 Cowl Intake Vent Covers (OEM) $88 1 HID Rectangular Fog Lamps (iPD) $60 (gift) 1 Tan Cloth Center Arm Rest with Cup Holders (OEM) $50 2 Upper Chassis Strut-to-Firewall Braces (iPD) $43/set (gift) 1 K&N Air Filter $42 1 Hood Quiet Kit (iPD) $40 2 Turbo Sway Bars (OEM) $35/set 2 Turn Signal Lenses (OEM) $25/ea 1 Front OEM Green Fog Light Switch $10 1 Black Antenna $10 1 Roll of Rear Deck Black Carpet $10 1 Large Tachometer to replace clock $4.99 1 Small Accessory Clock $4.99 2 Rear Chrome Trim Set $4.99/ea 1 Chrome Strip (Below Trunk Lock) $4.99 2 Used Wheel Cover (for spares) $3.99/ea 2 Sun Visor Clips $3/ea 2 Dual-Stream Volvo Windshield Nozzles $3/ea 2 Plastic Rear Seat Belt Covers $1.99/ea 2 Black Plastic Cover for Windshield Wipers $ FREE 1 Tan Plastic Ring for Door Lock Knob $ FREE