pcf - I know this is getting off-topic, but I'm intrigued by your last post.
I started out with MS1is, heavily modded them - and have actually ended up with a FWJ 325i (transplanted drivers, iroko full jacket). Anyway - I love the sound - but have often wondered if it is actually worth while going further up the ladder (RS1i). With your own cans - did you ever try the 325's in a wood jacket, and did it come close to a RS1i?
Don't take me seriously, especially the last post. I just collect headphones, I know nothing about them.
To answer your question- I have never heard any modded Grado with wood cups that sounded like RS1i. If you want RS1i you might need to just buy them. But then again you really need to hear them first to decide if you want the sound. Personally I am not a big fan. If you are happy with your wooden 325i, why not just enjoy your music with them?
Edited by pcf - 7/10/12 at 3:05am