don't do a shorty whatever you do. The power gains will just not be there.
Go long tubes without a doubt!
You might also consider the TSP 304 stainless 1 7/8" long tubes. We offer them in both cat & off-road versions & they are priced very very reasonable.
Not to mention they are fully polished, come with a warranty, and are made from the thickest header tubing available!!
http://www.texas-speed.com/p-2168-te...ro-ss-62l.aspx