suggestions needed

I looked at the web site regarding your sub and the list of T/S parameters they provide. That sub will NOT perform as expected in a sealed enclosure. It has an EBP of 102, which is way into the vented category. Look at these specs: Fs and Qes. EBP is the result of dividing Fs by Qes. The EBP is a valuable indicator of how a woofer will perform given the different enclosure types; 50 and below is a definite sealed category, above that to about 70 is an iffylookatitbothwaysanddecide situation, and anything above 70 (some would say 90)is a definite vented situation. At 102, this sub needs the vented box. Anything smaller than the 2.5 cu ft or so they suggest will result in a loss of low end bass response. And you can be sure that they are not going too big here with this suggestion, as space is always a premium in car audio. That is to say, if it would work okay with 1.75 cu ft they would readily recommend that size. Mo' money, but I suggest you find a different sub that will perform well in the enclosure you have, as it fits your truck. There are plenty to choose from. The MOFO is marketed as an SPL sub, and to the maker's credit they are making no pretenses to sound quality. With the right box and appropriate power, you can achieve loud sound. But just that, loud sound. If you would prefer a more musical subwoofer, look toward brands that are known to contribute SQ to your listening experience.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

Ahh...NoNeed I though you were a punk bastard trying to copy off of your former NoUSE..lol