do the l7 kickers sound any good in a sigle sealed enclouse at least 1.3cu.f. if anyone has any idea that would be great.

Yep that's fine :D .

For a 10" you can go .66 - 1.0 CU.FT sealed
For a 12" you can go .88 - 2.00 CU.FT sealed
For a 15" you can go 1.5 - 6.0 CU. FTsealed

Why stick with Sealed?? Why not unleash the Beast in a Tuned Ported enclosure ???

coz i want 2 subs in the boot and i dnt have enough space for 2 ported boxes

You dont Need Two Ported Enclosures, One Big one with a Divide in the Middle will Suffice..

What size sub do you have? A 12" for instance will perform fine in a 1.75CU.FT ported box.

I have Two 12 inch Long throw subs and Yes it takes up the entire length of the Rear of the Boot but I still have plenty of room for Groceries and the like as the enclosure is only as thick as the rear parcel shelf..

What amp do you have to power them