Recently I bought a brand new 3" stromung catback for my wrx. I was really pumped when it came in, next day a buddy and me went out threw it on (thanks subaru btw for bending one of my exhaust spring bolts, had to pick a new one up) and started my car up....annnd low and behold there was 2 leaks from where the donut gasket mated with the cat and the stromung midpipe (i think its the midpipe).
Anyway so I figure the gasket must not be seated right, took the exhaust off 4 times and tried reseating it..no luck. I figured then the gasket is probably shot so I go to stholmans and pick up another one (38 bucks

Now the leak isn't too bad, a small puff of air at the bottom and top of the flange (air comes out right where the gasket is, i checked the welds and there are no leaks coming form there). So I don't know what to do now! can i send this piece back to stromung for another because this is getting ridiculous! Any help would be appreciated as this gets more and more discouraging as I try to fix it

Thanks
-Eric