SR motorsports is extremely reputable, but pricey in the rx-7 world. I saw that system too, but wasn't very impressed with the tips.
But the pictures weren't very encompassing.
There will be several other systems coming out within the next three months, so if you're not postive about a current style, I'd wait, cause there surely will be.
However, if you do like the SR one, as I'd like to see it as well, let me know. Maybe APEX and I can cruise up there together and check it out. I'm sure I can get you a wholesale price on this, if they're willing to distribute it.
I just got the Bosal for mine, cause it's so inexpensive for me and is all polished, resonator and all. I knowt the Bosal will look good on the MP3 in comparison to the p5.
PM me APEX.
Later, Rishie