corksport cat midpipe vs rp supercat midpipe
 

So I am considering these two mid-pipes because they have a high flow cat that is durable from what I have read during harsh driving (autocross/tracking). My guess is that the rp supercat is obviously louder, but will it have any rasp at high rpm cause it doesn't have a resonator? What are your guys opinions on these two pipes for those of you running these?
Corksport resonated and high flow cat
http://www.corksport.com/images/deta...t-Racepipe.jpg

RP(rotary power) supercat
http://www.rx7.com/store/rx8/images/...rcat_large.jpg