Well since asked how can I refuse Stefan :wink :wink :wink
The Ida exhaust has baffles, saves weight and has gone through a rigorous design and dyno test phase with Ford monitoring. Also the Ida exhaust appears to have thicker gauge and a more substantial mounting bracket from CNC billet aluminum when compared to others.
Yes his is a "H" configuration instead of the "X". My understanding is that the "H" helped get a tone with no crackling sound and drone that many found to be irritating without any loss in performance. I know that various configurations were tested before settling on the “H”.
Aftermarket baffles may be difficult to install except near the end openings and welding may discolor and/or mar the polished finish. The exhaust tubes on the Ida and Accufab are not single piece pipes but pieces welded together. Before welding the pipes the Ida system has baffles inserted throughout the individual pieces. They can customize the sound level to a customer’s taste by adding or removing baffles during manufacturing and installation.
Hard use, meaning track days turns the stainless exhaust system blue/gold. I would think this happens with any stainless exhaust system. regardless of manufacturer But this blueing/gold can be removed through using polishes sold by many places especially motorcycle shops.
Additionally Ida has his own dyno for tuning and can do much more for your GT than most other tuners. They have probably done somewhere between 10-15 GTs, meaning pulley, chip, dyno tune, air inlet stiffeners, air box changes, air induction management etc. in addition to those he has just sold exhaust systems to or done routine maintenance such as oil changes.
At the end of the day everyone has to make their own decision as to which to use and if they want the original. I chose Ida because of his reputation, innovation, dyno, and physical location. While physical location is nice I also have other work done half-way across the country. So I believe in going where they do the work right and stand behind their efforts.
Hope this helps
Dave