ORIGINAL: AllAboutFunHobbies
Yes it's bad, with out the exhaust gasket there is no way to seal the exhaust system. If the exhaust system is leaking air it will cause your engine to run lean on fuel, which will inturn cause it to run hot and possibly over heat and burn up. I would highly suggest getting a set of HPI exhaust gaskets Part Number A875 these are the gaskets we carry for the redcats because you get a few extra gaskets for future needs. Or you can use gasket material and make your own gaskets.