Hi there, David. I didn't put 180s on my car, but several folks here in Phoenix have. My observations: They sound terrific - much smoother than stock. One car used Flowmasters for mufflers, and they are quiet enough for a subdivision. Another runs open pipes, and they shake the earth - it's up to you. They are apparently not as difficult to install/remove as one would think. You have three choices for tailpipe exit: Out where the license plate is, or where the grille for the A/C condensor is (which means you have to move the A/C). Or cut holes in the inner fenders and route to the stock location. Some folks run shields to protect the paint on the decklid, some don't.
I'll let others comment on performance issues. -Steve
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