It doesn't happen every time but some times, I have a lot of mods done to my car, an IHI VF 22 turbo, a INvidia performance Downpipe, a front mounted intercooler that i mod-ed on to it. A long with some other stuff. sometime when i am going up a slight hill, and i am in either 1st-3rd gear it will rattle on me. by rattle i mean the car shakes basically like the car is getting to much throttle, as well as the RPMs jump up. Anyone have any ideas as to whats going on? If not and you need more info please let me know and i will put it on here, I just changed the downpipe because my old downpipe had a heat crack in it so i put in the Nividia one in this weekend thinking that was the problem, but turned out to be something else. Any ideas?