Great tools for cutting through plastic.

[spaz12]

Got these from Harbor Freight for less than 10 dollars. They go through plastic body panels better than anything else that I've ever used. What I like most was that they made clean cuts, didn't melt the plastic and didn't leave a bunch of crud to clean up.

I would advise using extreme caution when working with them. 

[beaverhausen]

I use a 12v Milwaukee hackzawl works awesome