DASA, HMF, Sparks, Yoshi, LRD, Trinity
I have the trinity.
Lots of people on LTR sites have DASA's
I guarantee that the Sparks puts out good numbers also.
If I had to do it all again I'd go with the Sparks, LRD, or HMF
HMF is the best bang for your buck and has proven dyno numbers
LRD actually put out like 1 more HP than any other pipe.