An RX-7 makes a great sleeper around bigger and better cars. A base model FC with a 13BT swap, a few tweeks and a flat black painted intercooler will suprise a lot of people... and be a lot faster then most "sleeper" Accords.
Remember, an N/A 86-91 RX-7 is a low 16 second car stock. For some reason, Honda guys think they are all crazy fast. It's nice though, because all the local ricers are too afraid to rev at me. Nothing annoys me more then people reving at me.