Squarebody Adventures

One man's adventures of rebuilding a 1987 GMC R1500 Longbed

Exhaust

Short headers > Y-Pipe > High Flow Catalytic Converter > Muffler > Boom Tube

Headers:

Y-Pipe: Flowmaster Y250300

Catalytic Converter: Thunderbolt 3” Catalytic Converter (4” Round x 11” Long)

Muffler: Flowmaster DBX

Tip:

Boom tube

Summit Racing Volcano Wrap

Exhaust Pipe Sizes for Street Performance

Single OD (IN) Dual OD (IN) Power (HP) Engine Size (CI)
2.0 2.0 100 150-200
2.25 2.0 150 150-200
2.5 2.0 200 150-200
2.25 2.0 150 200-250
2.5 2.0 200 200-250
2.5 2.25 250 200-250
2.5 2.0 200 250-300
2.5 2.25 250 250-300
3.0 2.5 300 250-300
3.0 2.5 250 300-350
3.0 2.5 300 300-350
3.5 2.5 350 300-350
3.0 2.5 300 350-400
3.5 2.5 350 350-400
4.0 3.0 400 350-400
3.5 2.5 350 400-450
4.0 3.0 400 400-450
4.0 3.0 450 400-450
4.5 3.5 400 450-500
4.5 3.5 450 450-500
4.5 3.5 500+ 450-500