Backwards muffler by meineke

While inspecting my new Vortex V Baffle muffler # 88213 that was installed by my local Meineke shop I noticed that stamped on the muffler is an arrow pointing to one end and the word Inlet. This is connected to the tail pipe. It appears to me that the muffler was put in backwards.
Is this cause for concern? Does it need to be corrected?

Yes, The air flow of the muffler is to flow with the right amount of restriction in one direction. The other way could be to little or to much. Take it back and have them correct it.

I second that . Don't let them charge you either .

Charge him????? They should refund him or hook him up with something for the hassle and the stupidity!!!

Sounds like that idiot didn't know whether he was coming or going.

I agree! You need some kind of freebie!!!!!!!!

I agree! You need some kind of freebie!!!!!!!!
Yea like, 100% total refund. Complementary full oil change, grease, ect.........

DITTO to above. plus a free George Foreman Grill

-UPDATE-
After contacting the manufacturer of the muffler I learned 2 things. 1. The Vortex V baffle or 200 series design isn't available in a 2 1/4" dia. offset inlet center outlet that my truck requires.
And 2. The Vortex Classic or 100 series is the least restrictive of the two designs. It has a straight through design without baffles and can be installed in either direction.
Presented with this information the owner of the Meineke ordered me a new muffler and will install it for me next week free of charge.

And you get what for you inconvience??? "we'll repair our fuck up for free" is total BS! They owe you something for your time and trouble - I would threaten them with bad press on AF. Your expierience and the outcome will reach a lot of eyes!!! They could risk losing buisiness.