Narrowed my choice down to 2 subs.. some questions regarding enclosure size

[Camer138 10+ year member]

I am working with very limited space here.. I plan to put the sub behind the passenger seat in my toyota matrix. I am going strictly for SQ here, I don't care for SPL. I'm a Metal/Rock kind of guy.

My problem due to limited space is the enclosure size and I just want to know what you guys think I should do here.

My 2 choices for subs are:

NEW JBL GTO1014 10" Single 4 ohm GTO Series Subwoofer | eBay

which I would have to pay at least $130 for to get it in Canada.

Or this:

Infinity Reference 10" Car Subwoofer (1060W) : 10" Subwoofers & Under - Future Shop

which i can get for $70 on my girlfriends staff discount.

Both recommend sealed enclosure sizes of .75 cubic feet.

I measured behind the seat and can not go more than 11" of depth. as a result I will have to sacrifice some cubic feet here unless i go custom which is out of my budget and possibly get a .60 or .55 cubic feet box.

so.. will this enclosure size be too drastic of a difference and affect my subs performance in a negative way? how much polyfil would i need to help this situation?

and given the price differences, which sub do you guys think I should go for here?

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[Dtrom 10+ year member]

Jbl

 

[mylows10 5,000+ posts]

neither , go with an 8" sub instead

 

[BrownVanMan 10+ year member]

neither , go with an 8" sub instead

this and if its just a sealed box a custom one isnt hard to make just an FYI.

 

[Camer138 10+ year member]

my amp is 320w at 4 ohms.. would that be too much for an 8 inch?

 

[mylows10 5,000+ posts]

depends on the sub,my dd 1508 subs i'm selling are 300-600 rms each dual 4.ou could prolly do 2 8" andd still be under 1^3 sealed.you get more cone area that way which will give you better output as well