you dont HAVE to lower the compression... apparently its all in the tune, there are a few high compression turbos about... including dales old ep91 (austarletclub.com) that had a tdo4l turbo strapped straight on a n/a 4efe and was pushing 220bhp. which untill he sold it was running fine. but were getting a bit off the point here... stixnolan, if your engine has the jdm inlet manifold on it listed above you already have one of the most powerful versions of the 4efe, and there isnt much in the way of after market performance parts available for the 4efe but if your wanting to stay n/a, a panel