You can talk to Tony@FI for a custom solution that will put the cats further away from the exhaust side of the turbos. The 3" TDX already implements this design for the cats.
I've been running the FI HFCs for about 21k miles now with my Stage 2 TT. Am I supposed to see or hear something? It's the same to me since the day 1 haha. Exhaust is even quieter now after getting the new transmission put in.
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