80 Series Crossflow - 2.50" IN (O) / OUT (D) - Aggressive SoundThe 80 series is a cross flow design for applications where the muffler is mounted transversely behind the rear end. The inlet is located next to one of the outlets on the same side of the case. Delivering an aggressive muscle car sound both inside and outside the vehicle. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.