I run the Aaen pipe on my 87 and am very happy with it. Pulls good especially mid/top but is great on the trails as well.Decent MX pipe as long as its not a sand or tight track.Dirt, hardpacked, flat works real good. Sand MX tracks combined with 38mm carb and a lot of tight turns=constant shifting and falling of the pipe every turn.Was just out on the one sand MX track last weekend and once chewed up was shifting constantly and still falling off the pipe and lagging bigtime.Maybe a gear change may have helped a tad.Mind you pretty much all smaller CC quads struggle on that particular track

. Definitely gonna try the 500 next time.