(HeloMech74 @ Apr. 17 2007,21:27) You might want to consider the Tsukigi SpecII Race system. It's about the same price of most the systems that you posted, and makes some serious power as well. I bought my Stainless/Stainless Oval system from Greg at HPC. He gave me a great deal, and sent me a great PC map for it as well. I am running it with a Pipercross race filter, short velocity stacks, small airbox mod and the PCIII. I took it to a local dyno yesterday to see what it put down, and it made 174hp and 102ftlb of tq. I was very happy with the outcome, and there was no need to adjust the map that Greg sent either, it was pretty much dead nuts for what I needed.
The sound it great, and the build quality is by far one of the best I have seen. The welds are perfect. The fitment is tight though, so you need to make sure you have it all adjusted and set in place, test fit the plastics, and once it all fits nicely, go back and tighten everything.
Just my 2 cents though.