How do Project Silvia d/ps & t/ps compare?

[GamblerZ]

I am helping a friend map out a plan for his '98 SR-project car. He is convinced that 400whp can be achieved with high quality parts and minimal outlay, building the best bang for the buck ride. He asked me about the Project Silvia downpipes. They seem to have a nice product and it appears identical to the Greddy d/p I am using. Since I have no experience with these, how do the Project Silvia downpipes compare to others (ie. HKS, Greddy, Blitz, JIC, Tanabe, GP Sports, etc.)? Granted, some are 80mm, and others are 75mm, and all are definitely better than OEM. But I've noticed that some have more bends while others have only a single right-angular bend.

Now, when you pair it with their resonated cat bypass pipe, it seems to me to be quite an exceptional value at only $130 (shipped)? Does anyone have experience with these?