Can someone please explain it to me, what is this mod? i've been searching it but it only says like hte name not the description. Please tell me what it is?

Thanks

Got a 98 Contour SE ATX

Kill List:

Camaro V6
Integra GS
Dodge Stealth
S-10
Chevy Pick Up V8
96 Accord
Cavalier z24
Honda Civic
Chevy Pick Up Vortech V8
Toyota Celica GT