2016 GT Perf Pack. I just drove it for the first time after an HPDE day two weeks ago, and the clutch feels a little funny.

It still seems to function properly but the motion is no longer butter smooth. I can feel it catching a bit near the top of the travel when a gear is engaging. There’s a little bit of friction that wasn’t there before. The problem does not seem to happen if I’m just sitting in neutral and pushing the clutch in and out.

That track day was a hot one. 90+ degrees. I was pushing the car pretty hard and the rear axle got the over temp warning. I didn’t notice any clutch issues that day though.

Any ideas?

Assuming stock clutch and setup.
Consensus appears to be that stock clutches don't like high rpm, clutch fluid which is also brake fluid get "cross" contaminated and affects the seals on the clutch cylinders. Slave cylinder doesn't play well with certain high temp brake fluid.
Your description is a little ambiguous, always difficult to describe something you are subtly feeling.

RedStallion27 said:

I can feel it catching a bit near the top of the travel when a gear is engaging

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Assume you mean, and i being pedantic for a reason, when the clutch is engaging with the gearbox in gear. Or do you mean the gear selection is catching at the end of travel with foot on clutch.

RedStallion27 said:

The problem does not seem to happen if I’m just sitting in neutral and pushing the clutch in and out.

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Which would give us a direction as it doesn't happen in neutral.
If you can elaborate further i'm sure others will have good information.

RedStallion27 said:

I just drove it for the first time after an HPDE day two weeks ago, and the clutch feels a little funny.

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I drove mine after a clutch upgrade and was sure they had shortened the clutch pedal travel. Nope, just felt so different. So many factors involved.
Would however look into divorcing the clutch from the brake system if you intend thrashing it frequently.
https://trackmustangsonline.com/search/1411108/?searchform=1&q=clutch+divorce&o=relevance

Thank you. Yes stock clutch system. 13K miles.

The odd feeling occurs when the clutch is engaging the gearbox in gear. The clutch moves smoothly (without the friction) if I let it out while the shifter is in the neutral position.

I’ll read up on divorcing the clutch from the brake system.

Which clutch did you upgrade to, and do you recommend it?

RedStallion27 said:

Thank you. Yes stock clutch system. 13K miles.

The odd feeling occurs when the clutch is engaging the gearbox in gear. The clutch moves smoothly (without the friction) if I let it out while the shifter is in the neutral position.

I’ll read up on divorcing the clutch from the brake system.

Which clutch did you upgrade to, and do you recommend it?

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Exedy Hyper Single has been everyones recomendation. Depends on usage though. Yes its streetable, would i want to drive it in traffic daily, hell no. Its a firm pedal and bitey, very limited slip. No officer, i can't get it off the line in the wet without some wheel spin.
Unfortunately i'm not that mechanically experienced when it comes to potential issues with the clutch system.
However, when i got the mustang, i struggled getting the clutch to engage cleanly every time. I attributed it at the time to the very soft stock seats, as you released pressure on the pedal you also moved forward in the seat a subtle amount making it a dual motion. Changed seats to a firmer Recaro and the issue disappeared. I was now just controlling my leg pressure and not my body moving. However it could have been the throw out bearing sticking slightly so the pedal continued then the cylinder jumped to catch up. So many moving parts in there. I replaced the throw out bearing while they were doing the clutch. And the input shaft bearing.
If you have the easy option of getting the rear in the air and try it again so there is only driveline load. Will it be the same as in neutral then?

Clutch divorce.