That's where I'm at. Mine has almost 119K and runs extremely smooth. No shudder, idles without the slightest shake or vibration, even with the air on. I do not drag race so really, IMO (in my case), why spend the cash to perk it up faster and cause me to get a ticket that's just gonna cost me more money and higher insurance rates? I'm just speaking for myself here. I want the booming system in mine for the HWY rides. Kinda like a NOS bottle. You know it's there whenever you need it.
I go for the appearance on the interior, has to have a system in it and I do all that myself. Next will be exhaust. Already have the wheels that I wanted to put on it but haven't put them on yet. After that, LSC front and rear bumper covers and I'm calling it a day. I'm done after that. Air ride is 100% complete and all new Motorcraft. I can't call that a modification but I can say my car is very well taken care of. I love my car and I try to treat it with respect as if it were a person.
Mods that concern stalls, gears, Cobra intake, supercharger, twin turbos, C-heads and all the other stuff associated with these things will never happen for me. Has nothing to do with not having the money for it. I got it but not wasting it on stuff like that. I just want a nice clean ding free, rust free Mark VIII. That's all.
People that do choose to make their Marks stomp out 300 to 500 RWHP, I'm happy for you. It's your hobby and that's what cranks your tractor and makes you feel good. Will I ever see you to race? I doubt it. If I know you can beat me, I ain't gonna race you anyway lol. I do admire many of the Mark VIII's on here that have been modded. I don't look down on those that want to do the things they do to their cars. Again, if you do it, apparently it is your hobby and you get a good feeling from doing it and you only live one time. Do what makes you feel good and be proud of what you have accomplished with your car.
One thing I do hate seeing is for someone to have a nice Mark but they're broke as a joke. No Mark VIII should be owned by anyone that stays broke, period! If you don't have the means to take care of it as stock or modded, let the next man have it that can. Ok, I've said more than enough.