Muffler exploding inside?
Anyways, the car had a TERRIBLE tune before with the cam and I guess the muffler finally gave out once the new longtubes were put on about 300 miles ago. I went ahead and got it dyno tuned with the supposed messed up muffler, and it put down 376 rwhp/ 372 rwtq cam only - 226/236 ASA. So does this sound like a plausible reason for the muffler dying and do you think the hp numbers were affected badly? Thanks
I'd would look more at the catalytic converters if you have/had them, a bad tune that caused cats to overheat results in them breaking up and if you blew chunks of catalyst back that could be lodged in the muffler.
The catback is a tsp rumbler i forgot to mention, and from what I have read there are spiral things inside the muffler





