Aftermarket Catback Exhaust Piping

[TongMan]

I was looking to gather more information about the available catback exhausts before making my purchase, but I found that the exhaust piping was a little harder to find as it appeared the manuafacturers does not like to advertise it in their descriptions. I finally found all the common brands and made a list. I'm sure this information would help others in finding the exhaust to fit their needs. Owners of specific exhausts, feel free to correct any mistakes.

Stock OEM:
57mm or 2.25"

NISMO:
62mm or 2.44"

Invidia Gemini:
60mm or 2.36"

Fast Intentions:
65mm or 2.55"

Ark:
65mm or 2.55"

Berk:
65mm or 2.55"

HKS:
60mm or 2.36"

Tanabe:
70mm or 2.75"

Greddy:
60mm or 2.36"

Stillen:
65mm or 2.55"