Hey dose anyone know what series this flowmaster exhaust system is????

 

if it even is a flowmaster it would be the 80 series cause thats the only crossflow muffler they have

 

That may be true now, but the 80 series is a much larger bodied muffler than that. They used to make smaller ones like the one pictured that were louder than the 80 series are. I have one too, but don't know what it was called.

 

I agree the ones that fit our car are 80-series, larger body and have 2 different input sizes. I never saw any older or smaller body muffs. The G-bodies also have crossflows, but I think are the same case size. I wonder if thats a truck single in and dual out. If so, then the inlets on the left (looking at the pic) and the outs are on the right. So thats a jacked up and in-effecient way of routing the exhaust.

 

I have an 80 series and I also have an old smaller one that is definitely a crossflow. I would describe it as a crossflow 40 series as far as size and sound goes.