Wow information all over the place,
First off no there aren't any SRT-6's without supercharged motors
2nd for the 2k6 model year they introduced a special edition crossfire that only came in "flamer red" It had SRT like wheels, the inside of each spoke was painted the very cool color Graphite. Silver strakes, and a black windshield surround. All of them are Manuals I believe. Base model seats... I'm sure I'm missing a few other things but that the most of it.
I believe there are close to 150 SRT6 made in 2k6. Still very Rare if you've got one.