Replacment Exhaust

hey my bro needs a new muffler and it cost way to much to buy a new stock one since GM parts direct doesnt sell them.

I was thinking the flowmaster 40 would be a good replcment but I need to lnow which one to get... I just want the single output. Which offset do I need? does it hook up to the eco fine? do I need to buy new tips with it?
Thanks

[Redog]

It won't be an exact fit, you'll probably need new pipes for that, but by the sound of it, you'll need them anyway.

Just stay below 2.5" pipe

[BLK03GXS]

I had my 40 series flowmaster just attached and mounted to my existing pipe, i have the offset in-center out 40 series, 2.5inch ID.
I had to add a tip, with that muffler the tip has to be short, i used a magnaflow one.