New Universal  Wheel well/False floor enclosure READ ALL INFO! Check it fits!
Very adaptable to whatever you need !
can also be used in the wheel well as a fancy way to mount an amp under a false floor , see pic

Please note: if this one is loo large - check my other items, there is a smaller version ! :)

I have seen so many attempts of this build type where its not done right , most just put a board over the wheel well and sink the sub in it , this is no good! It has to be sealed air tight or correctly ported,  unless running free air subs. This is the all in one solution....

1.54 cuft sealed volume

suitable for subs:
1x15
1x12
2x10
upto 3 x 8

max mount depth  7 inch – can be extended by adding more mdf on top

Please check against your subs required volume

The easiest way to add up to a 15 inch woofer to your car without taking any boot space !
Do away with the spare for a can of tyre weld.

Comes in 2 options,  

the basic DIY mould with flange, this needs to be screwed/bonded to the underside of a false floor – easy enough to make
This is 55.00 bare fiberglass

Or the sealed top version ready to go,  this can be dropped into a wheel well/floor and used as that or again fixed to the underside of a false floor but this offers an easy way to recess the sub so its flush as pictured.
This is 80.00 with optional..cut outs ready, carpet any colour, rounded edges 

Dimensions  - Measure and check !

Outer diameter of flange– 26 inch
Inner diameter of flange – 22.5 inch
height to top of flange – 7.25 inch
height with added mdf top - 8.25 inch  

Please note, if your cars well has a central bolt to hold the wheel in place, this will need to be cut off with an angle grinder. Thats if the sub is going central – if you put the sub to one side you can just drill a hole and use this bolt to anchor the enclosure down with a nut.