With all those ups and down the oil will build up inside the exhaust and it will eventually hurt your engine because it has nowhere to go.The HPI rs4 3 Type SS is a good kit.I have one and love it.One of the first things you should buy for it is a new Tuned pipe the one it comes with sucks.Buy the fiber disc brake also because the stock plastic one wears out really fast and get a motor savers filter for it because the stock one is small and it needs to be cleaned often.If you got any other questions just ask.