I run an Upsolute (
www.upsolute.com) chip. They $300 and take you from 90 bhp up to 120 bhp and also a signifigant bump in torque. (Contact Rene Berube
rberube@upsolute.com 704-588-0207 for exact numbers)
Wett also makes one. Similar numbers and I think slightly more money. There are several others but I do not have direct experience with them.
Upsolute also does chipping for Porsche. Pretty impressive numbers.