Well u saw gains cuz with that 3.4 pulley u really needed some exhaust mods. Most guys on here will tell u a pulley swap should be way down on the list of mods. But u should look into a bigger down pipe or u bend delete also. That will help. Plus I just got my new pcm in and it made a big difference. Cheap upgrade too. If u can find used parts that's really the way to go. I got my pcm for 80 bucks from a guy on here and I got my 3" downpipe and plog manifold for 60 bucks. Just gotta be patient when lookin