hey Nino,
yep, I remember that conversation, it was very helpful, thank you for you time. It was just before I pulled the trigger on that Fabspeed setup.

I didnt hear any noticeable diff in sound with the headers. I feel like the only diff in sound was effected by the sport cats.
As for PSE vs none PSE, in none PSE, all sound the same to me. With PSE on, headers made no diff but sport cats did open her up and made it growl louder. Not too loud, but a good loud that makes you smile when pulling over 4RPM.

I was very worried about an the turbo whistle becoming too much, but I can’t say it is that much more noticeable. Though the sound clips do bring that tone out, I can seem to movie it as much. I’m starting to really like the way these 991.2 sound, and I’m not trying to start a 991.1 vs 991.2 battle;)

I went ahead and bought the FabSpeed headers and sport cats for my 991.2.
I did the install myself and decided to try each component separately.
1. headers swap only, left the OEM cats and muffler.
2. Sport Cats only, putting back OEM headers and OE muffler.
3. Both headers and sport cats with the OE muffler.

Keep in mind get the findings are based on feel only, same route with similar weather conditions at similar times of the day (evening).
My feel comes from spending a few good years on race motorcycles, where the inputs we get from throttle, breaks, chassis and suspension are key to winning.
I know it isn’t going to be as accurate as a dyno, but these are the findings.

1. With headers swap only, I couldn’t feel any diff from full stock OE.
2. With sport cats swap only, I did feel a significant diff in response, felt quicker and obviously louder.
3. While I was under the impression that since 1 didn’t make any diff, I was surprised to find out that with both headers and sport cats, I did feel a noticeable improvement over sport cats only. It felt much quicker than the all stock, and it also felt quicker than sport cats only. I’m not so sure why, but I tested it again just to be sure and it is noticeably quicker with hears and sport cats (3) vs just sport cars (2).

These were my findings and I’m not sure I can explain why. And there may be a chart out there that may show that I lost something somewhere, but for a feels prospective, I feel like the car is significantly quicker with (3) than any other setup I tried.

Hope this helps somone

there is nothing like taking it out for a spin and trying the diff setting yourself. While working on it myself was long, and left a good number of cuts on my hands, it was very rewarding and fulfilling. 🤙

Lol, the FB screw holder was too deep for the OEM hearshild screw. It took me so long on that part. Gave up and went to get a screw that was a tiny bit longer and solved it the next day. That was the only unplanned part.
Did you take out the muffler, bumper and wheels?

ceramic heat coating?