The pictures look like the stock exhaust, which is stainless steel. This is one of the awesome reasons for having a SHO, while my Tempo had probably went through three rusty mufflers, flex pipes and stuff, the SHO is still going strong on the stock exhaust.
The exhaust can be polished as much as you want, but first you have to get it clean. That's the hardest part, after scrubbing with a firm brush or brillo pad (only go forward and backwards so you keep the 'grain' of the stainless) there will still be baked-on road tar and grit that really won't come off with anything less than an ice scraper. You'll probably have to hit it with foamy engine brite, SEM Solv pre-paint stripper (great for road tar), or whatever else and more scrubbing to get them bare-metal clean. Then you can polish with some rubbing compound to start if they are really rough, and then some Mother's metal polish.
My brother pointed at my exhaust and thought it was 'ricer' that I put (what he thought was) shiny exhaust tips on my SHO. I had to tell him the whole exhaust was stainless and I could polish it that shiny all the way back to the engine if I wanted.