Finally got the sls catless midpipe installed on my g/f's p5. The resonator pipe was rusted so badly from a couple md winters that it had to be replaced in order for it to seal (thanks to evilmonkeymsp for the spare pipe). Car feels better and pulls a lot smoother in 5th on the highway, plus I am not getting the horrible rotten egg smell on the highway.
And don't worry magnum I know where you are coming from. Used to own a fairly modded msp and now daily drive the g/f's mildy modded p5, even though my rx7 is slightly faster than the na p5 its a lot more fun to drive than my msp was. Between the rwd, the scream of the rotary and the handling its well worth it. If you do stick with the na rx7 make sure you get a lsd, exhaust, and refresh the suspension.