That is a good question and I actually asked myself the same thing during my search for an exhaust. I contacted a few custom exhaust shops in my area (Virginia) for an estimate. I was looking for a 3" dual setup for my Z. Every shop I talked to told me that I would be looking at a price at least as much if not more than the manufactured products (I was showing the shops the F.I. TDX for reference). Many of them blatantly told me that they would have to charge me more and their quality would not match the F.I. My situation may be slightly different, since I am looking for mostly higher flow with my TT setup, but I would think any N/A focused exhaust would be similar (price vs. quality wise).
I would suggest checking out the manufactured options. I have an Invidia Gemini currently that I am getting ready to get rid of and am waiting on a 3" TDX from Tony. After speaking with Tony and reading all the rave reviews, I must say I wish I had gone with FI from the start.
Hope this helps!
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