In for some answers too. I also been getting this "Thump" sound from the rear passenger side, its annoying and cant figure it out. I got function and form type 2's.
I have that same sound coming from the rear of my car too. I did install the function form type 2's not long ago, so idk it might just be the end links.
bro, it's been done. Actually if I remember correctly, their is a dude in this website that has done it. I'll post a link as soon as I find it. But he is right, h22 would be a better deal.
A nice swap would be nice, f20b or h22a. Or if you want to stand out and have the money and patiance you could go for a K swap. If a motor swap isnt what you looking for, than turbo charging it could be a nice option. You could get decent #'s, as "Cleansleeper" said iron walls are great for...