Mtx ts85 trying for the sky with these

[ssmokeyy]

Ok the car is a 94 integra rs with turbo build on the way. Rear 2 12 mtx ts85 with one sound stream Rubicon 1600d. Mids and highs diamond audio d6 4 years old with rf power 800.2. Last year i hit 143 db with 2 10 digital audio 200 dollar line with the power 800.2 amp. Box was 3 cube tuned to 32 hz. This year im doing 4 cubed tuned to whatever mtx has on there sheet. With 2 times the cone area and power im hopping for 148 if not more. Dose any one use the ts85 subs? Do they break easy or can i feed them power? Thanks for any help you can be. And dose any one know what the best size box for these guys or should i start 2 cubed ported per sub and move up and see?