● Diameter: 4"
● Shell: 4"
● Overall Length (OAL): 6.5"
● End Caps: 2", 2.25", 2.5", 3"
● Neck: No
● O2 Sensor Options: Center, End, or Both ends
● Substrates: Many available
● Material: 409 Stainless Steel

● Diameter: 4"
● Shell: 4.5"
● OAL: 7"
● End Caps: 2", 2.25", 2.5", 3"
● Neck: No
● O2 Sensor Options: Center, End, or Both ends
● Substrates: Many available
● Material: 409 Stainless Steel

● Diameter: 4"
● Shell: 6.5"
● OAL: 9"
● End Caps: 2", 2.25", 2.5", 3"
● Neck: No
● O2 Sensor Options: Center, End, or Both ends
● Substrates: Many available
● Material: 409 Stainless Steel

● Diameter: 4"
● Shell: 8.5"
● OAL: 11"
● End Caps: 2", 2.25", 2.5", 3"
● Neck: No
● O2 Sensor Options: Center, End, or Both ends
● Substrates: Many available
● Material: 409 Stainless Steel

● Diameter: 4"
● Shell: 6.5"
● OAL: 13.5"
● End Caps: 2", 2.25", 2.5", 3"
● Neck: Yes
● O2 Sensor Options: Angled on End
● Substrates: Many available
● Material: 409 Stainless Steel

● Diameter: 4"
● Shell: 6.5"
● OAL: 13.5"
● End Caps: 2", 2.25", 2.5", 3"
● Neck: Yes
● Heat Shield: Yes
● O2 Sensor Options: Center, End, or Both ends
● Substrates: Many available
● Material: 409 Stainless Steel

● Type: Narrow Body
● Shell Options: 4.5" (5.5", 6.5", 8.5" available)
● OAL: 8.25"
● End Caps: 2", 2.25", 2.5"
● Neck: Yes
● Heat Shield: Two
● O2 Sensor Options: Center & End
● Surface Area: 30% more than R4
● Substrates: Many available
● Material: 409 Stainless Steel

● Diameter: 4"
● Shell: 8.5"
● OAL: 13.5"
● End Caps: 2.25", 2.5", 3"
● Neck: Yes
● Heat Shield: Yes
● O2 Sensor Options: Center, End, or Both ends
● Surface Area: 58% more than R4
● Substrates: Many available
● Material: 409 Stainless Steel

● Shell: 20"
● OAL: 28.5"
● End Caps: 3"
● Neck: Yes
● Heat Shield: Two
● O2 Sensor Options: Center & End
● Substrates: Many available
● Material: 409 Stainless Steel