I couldn't agree with you more @Lorne34 & yes, maybe age is a factor.
My exhaust is completely stock and it sounds fine to me just the way it is.
My wife has a 2015 GT Premium that has an aftermarket exhaust system (I couldn't tell you which one, but I'm certain the factory resonator has been...
I'll preface this by saying this is just my opinion.
That said, cleaning the undercarriage is a very good way of monitoring & tracking the wear & tear on your vehicle.
Other than your maybe your tires, the undercarriage is the part of your vehicle that has the most direct exposure to the road...
I'm pretty OCD when it comes to keeping my vehicles clean.
That said, I don't have a lift and I haven't jacked my Mustang up yet, (only bought it a month ago) to clean underneath it, the way that I want to.
Even at almost 56 years old, I still do all of my vehicle cleaning by hand, no pressure...
You're correct @StangTime
The original GT350 shift knob does have a different thread pattern, that won't fit the S550s.
However, this GT350 shift knob, was designed specifically for the S550, so yes, it is a direct swap.
Here's a link...
So, since you didn't really provide a cut & dry answer, I'm going to assume by squared, you mean having all 4 tires the same exact size with a level suspension?
Is that correct?
I did a very simple shift knob swap from the old stock shift knob, which I didn't really care for, to a new GT350 shift knob, specifically designed for the S550:
Old Stock knob:
New GT350 shift knob:
I really like the look of it and it feels great in my hand, compared to the old stock...
A-Pillar rubber plugs came in yesterday and this problem has been fixed.
Still pretty tight getting my hand in there, but with a little ingenuity, I got it done.
I wanted to try & use Black Silicone/RTV to seal the plug in there, but there is just no way I could do it, without getting it all...