I was looking under my D today and I think my muffler is on backwards..... could this cause any problems? The muffler say inlet on the side the exhaust is exiting from....

 

What brand of muffler is it? And what model also? I know there are some mufflers that are reversible in terms of flow and some aren't.

 

I'm not sure, it doesn't say on the muffler unless its on the top of it, it says inlet on one side and outlet on the other and I know its some type of performance muffler, maybe magnaflow or dynomax. It was installed on the D when I bought it about 4 months ago