For the money, shorty's aren't the way to go. Get the JBA long tubes and you will be happier with your investment. I will say make sure you have your clutch and tranny where you want them mod wise, cause once you go long tubes, you have to remove them every time you need to get into your clutch/tranny. It is a PAIN in the butt - but well worth the difference. better yet, wait about 4 weeks, and JBA will be launching their new 3" long tube set-up.
Remember too with headers and exhaust set-up (whatever you go with) you will have to remove your cats and downstream 02 sensors if you want to run 106 octane or higher. You will fry your 02's and put your car into failsafe if you try to run high octane with them. If you're going to start making serious power (over 400 rwhp) you need to run high octane in your race tune to help cushion the 2 weak areas these engines have (rods and pistons).