How different / how important is back-preassure to how well a gas engine runs Vs a nitro ?
I have a muffler for a dle30 that has some leaks in it due to a modification to the shape of it. how airtight (aside from the exit ports) should a gas engine muffler be ?
I recall my muffler coming off of my lawnmower and it still ran- just really loud. - This may be very different (or not)- but how -also will it affect performance ?