If you've got the $$, JL Audio makes custom enclosures that go under the seat of the 08 crew cab, but they're pretty pricey. I know my 05 has enough room to put a couple 10s behind the seat, but I'm not sure if the 08 is different as far as cab room goes. I've only had my truck for a couple weeks, so I haven't gotten to that point yet. I do most of my research on Crutchfield.com. Most of the time it will tell you what fits your particular truck. Hope that helps a little. Good luck!
I have dual 12" under my seat. Its a little tight but it does the job. I think I payed about $80.00 so it wasnt that bad. Sounds really good though. But I would rather have subs behind my seat. let me know if you find anything
Thanks fellas. I might end up building something. I just need a little thump maybe one 10" sub. I want to put them behind so I can still use the space under the seat if I need to. I might just have to try out one of those new fancy shallow subs.
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