I recently traded a '00 GT on an '01 cobra conv. and I can't really feel the difference in hp that I thought I would. I heard from someone that convertibles were tuned down for safety reasons and I don't know if that is the case or not. I have ordered a K&N filter and housing but haven't modified anything else, yet. I was thinking of getting a chip or tuner but I don't know how much that will help. Any info would help.