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Its due every 72K or 5years. Whichever is sooner....
BBPT charge £134+VAT iirc.
Where are you based?
It might be worth going to a specialist like HillPower, GDI, BBPT or K-Tec.
You just have to stick with it, and keep trying....
Ive got a 4x60W Alpine H/U thats quite long and loads of wires coming out the back and still fits in nicely.