I joined to find info on any tips for when I SR20DE my B310 and came across this. Just wanted to say you're doing a great job.

Did you modify the original front crossmember or use an S13 one? I've seen the mad dat kit but it'll probably cost almost as much as I paid for the car to buy and ship over to here.

Doesnt have to be full all the time but nice capacity if needed for long cruises.

Bit more alloy/foam unfilled is a good compromise balancing heavier donk.

Thanks and welcome to the forum. I used both, i cut out the mount section of both and swapped into the b310 leaving the bottom of the b310 one intact for the length. it took a couple of tries to get it right. but i was also putting in the rack and pinion from the s13. Good luck with your build.