Like 9mm Kurtz..9mm Short
Yep, that's the German designation for the .380 ACP (US). You can easily get lost in that stuff too.
Now straight from the Dodge site, STP (Super Track Pak), a $595 option that's bundled with the 20" chrome clads on an R/T, is:
245/45ZR20 BSW Goodyear Performance Tires
Anti-Lock 4-Wheel Disc Heavy Duty BrakesAnti-Lock brakes are equipped with electronic sensors that prevent wheel lockup, offering improved steering control under extreme braking or slippery conditions
Performance Steering w/Variable Displacement Pump
If you don't mind my saying... you're all over the map, my man! Are you really still cross-shopping SRT and SXT, looking for performance AND economy AND comfort? I think you should focus primarily on budget and must-haves based on how you're going to use the car. It's an elimination process unless your funds are limitless. Once you've narrowed it down some you can study all the options for those models on Dodge's site (I know it's not the best). Your budget will make a lot of decisions for you. And then,
if still confused or looking for some hard-to-find info, you can ask for suggestions or clarifications here; that's how forums work, brother! You're making us (not that we're not game) make all the homework and thinking for you. I hardly ever ask questions on here, but I registered so I could use the search function and most everything has already been discussed. Example:
Super Track Pack - Consists Of?
OK, this particular thread is about comfort
. Since it's a very subjective thing you get opinions all over the place. Mine is that you (not the collective you - I know that some are allergic to roll) should stay away from most handling packages; those are usually bundled with the big rims and narrow tires. And if you're concerned about mileage and gas guzzler taxes, you should look at the price of those fancy shocks first: sqeaking=bad shocks
A Challenger will be more comfortable than a real sportscar (or a stang), but even in stock form... it's decent, but not overly plush to me (seats or suspension).
Trying to help, but we're getting round and round and round...