I read an article in Four Wheeler mag. where they modified a gen.1 xterra with a high output 180 amp alternator, a Gibson exhaust system, and went to Jet performance chips where they modified the ECU and gained additional 14 horses but you have to run 91 octane gas. Alot of work for not much more power but it was a good read.....Anybody using one of those performance chips on ebay that say you can get an additional 20-25 horses for like 30 buck....I dont know personally but if it looks and smells like bull crap then it probally is...like to here if someone is using this thing.