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Ok so my truck is pretty much stock except a 4" turbo back with the cat in place. For some reason my truck will randomly rumble a nice deep exhaust note at idle for like 3-5 seconds. It never did this before but now it will do it every so often. Anyone else have this happen, or know what it is? I kinda think this started to happen after installing the downpipe either way its weird that it just started.