If you want to tune ... build your own or buy historical. From this point in history everything is highly networked and updated due to bugs. You'd best be served by buying historical vehicles.
I only have a single data point on a Borla setup. Maybe some others might be able to compare. I will say that link you had shows decibel differences between the different lengths of tubes. Might use an app on your phone and use various cloth covers over exhaust to measure decibel variations and...
The Borla S-Type Catback come with what looks comparable in your link to Slip Fit / 3.00 in Packed Resonator | 2-3 dB, if that helps. The 3 inch ones. Need 2 between H pipe and mufflers. 1 in each run.
Yes, AI isn't intelligent at all but can be great at summarization; just don't want that recursive probability to start hallucinating. I thought it did a great job in this case especially being that I have the Merge X-Pipe :like:
I can have any exhaust I like as long as it says Borla, LOL.
I found on my GT Premium which has them to just trim the front part as seen on a steeda video but leave the rest. Slightly cantilevered due to panel but holds it up tight. Would rather the protection it offers than not. Still works like a charm with my vevor 7k lift.