I'll definitely check out your build thread. Sounds like you've got the winning formula I'm looking for.
Here is a pic of my undertray:
I only had a few hours to make it, with limited tools, so it doesn't look very pretty (it's not even complete, so I'll figure out a way to secure it in the rear, don't worry) but I think it seals fine.
Mazdaspeed engine mounts
need to be replaced every so often, don't they? Would you still recommend them in spite of that? I was thinking of getting ones with stiffer (poly or something) bushings.
Did some reading on door bars and they definitely look worth it. Something I haven't been able to get a clear answer on, though. Do door bars negate the benefit of the butterfly brace? Should I just keep the frame rails and sell the butterfly brace when I get door bars?
About the 1.6 vs. 1.8 topic:
I'm seriously torn on this subject. Will need to think about it some more, but I definitely do see the logic in it.
Thanks for the suggestions, and going into detail regarding the measurements. The "norm" is definitely different on Subarus so I would've never guessed a balanced setup would consist in such thin rear bars. I'll look into the brands you guys suggested.
I could've sworn the rear one was 19mm, but I could be wrong. Will measure them again over the weekend (when I have access to measuring tools).
Curly and Carbon:
So do you guys disagree with Braineack then, regarding the suitability (or lack thereof) of the size of the sr20 t25 turbine housing? It definitely looks laggy on that dyno sheet he posted. Peak power output doesn't seem to be his complaint. It's spool, which you've claimed is good.