Sub question

I've got an 06 regular cab tacoma and was wondering what sub ur running. I'm looking for a very shallow box. I don't need something big and expensive, just looking for something to give me alittle bass. Thanks

 

Probably the cheapest (and smallest) solution would be a small powered sub from Infinity, Auto Ordinance, Soundstream, Kenwood, etc. These won't sound the best, but they are cheap, self-contained and easy to install. They will add bass to your system, and allow you to take a little of the stress off of the stock speakers.
If you want to go with a separate amp take a look at a 10" shallow mount sub. Pioneer, Kenwood both make acceptable shallow mount subs. Finally, if you can take the depth (I'm not sure if you can in a Reg. Cab) 1-2 8" subs will still allow you to run a very small box (.3 cuft per driver.)

 

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