I have the JDM SR20DE that came with my Champaine top JDM DE motor. I've heard you can gain a little power from these things. I believe it, the tubing looks like it flows smoother, and it definitely noticely bigger in size.
Make me an offer. Something reasonable. An it's yours. You pay for shipping. I need it out of my garage!
If you need pics let me know.
best way to get ahold of me, that or PM me.