excursion/air velocity too high?

Alright, So I have been trying to put together my first real system for the past couple of weeks and unfortunately did not find this forum until last night. Which by the way has already been very helpful. My problem, I already bought the subs and started building the box before I got my hands on winISD, and since then I have some concerns with the setup I am attempting to use. Let me intro a little; I have an 07 Tundra, with very little room to work with under the back seats. I bought two 12" Pioneer Premier shallow mounts (TS-SW1241D). I picked up an Eclipse 34230 Amp. Now for the box that I have already 85% built...I only have .66 cu ft in one chamber and .65 in the other. Now here is the part where I think I f'ed up. I ported one of the enclosures thinking I would have the nice tight response from the sealed and get a little more SPL (right use?) from the ported enclosure. BUT, I didn't see the recommended port specs in the sub manual before I built one....first oops. Now I need to know can this be fixed? Can I just make the port longer? Can I seal it back up? I took some screenshots of widISD for those of you that know everything, from what I read I gather that my "rear air velocity" of ~227ft/s @ ~70Hz is going to sound like crap?? Also the cone excursion looks like it could be fatal for my sub? Here are the screen captures: Ported Air Velocity with current port dimensions Ported Air Velocity with extended 11 inch port Cone Excursion chart @ 350 RMS Watts Just for more input here are the SPL and Transfer Function Magnitude levels My bottom line questions are: is my box shot? Is it going to sound like crap? If so is it fixable? Thanks a million for any info the experts out there throw my way.

I just realized you can't hardly see any of those pictures...how to I upload them so they are visible?

Almost too simple..ha, ok. Thanks for the quick reply! You were just the guy I was hoping would respond, awesome info on winISD also. I didn't think I was re-inventing the wheel...Im just a noob... Anyways one follow up question, in attempting to make the look of the install clean I used one piece for the whole face of the box (the part closest to the front of the seat) and that is where the port is...can I put another 3/4" piece on the inside and seal the crap out of it or should I start over or.....?? Thanks

well, I cut a piece and slapped it in there nice and tight...I think it should be fine. Thanks for the help! I would replace the front baffle but the face is designed to go all the way across my under seat area (covering my amp area and another box front. Its easier to keep in place and looks a little nicer. So replacing that would totally screw up my other 90% complete box