As far as performance gains, don't expect much. Maybe a little better pull in the high RPM's, but nothing substantial.
I just did my resonator last week & it makes a noticeable hp gain. It feels quicker off the line and makes pre 3500 rpm hp better (high rpm are sweet too). I think this mod added more hp than my intake. If you can feel the difference, it worth the money. I wish that I had this done earlier.
