I miss my MR-S. Had bracing all around, C-ONE quad exhaust, TRD air inlet, TRD catalyzer, TRD headers. Like the FR-S, you could enjoy the sporting feel at daily commute speeds. My G35 that replaced it felt numb in comparison.
Before I sold it, I parted everything out, bought a stock header, and gutted the pre-cats as a courtesy to the next owner to prevent engine failure. Not smog legal in CA but they never check.
Scion head units were a popular plug-and-play mod. On mine, I programmed a custom .gif animation of the Techno Pro Spirit MR-S (shown in pic) captured from a Best Motoring episode.