• Turbo 5 bolt is made for 2.5" piping.
• 3800 header flanges have 1 3/4" bore.
• T4 mild steel flange is 1/2" thick.
• All stainless flanges are 3/8" thick unless listed otherwise.
• 3 bolt 2.5" flange is used on some 3400 downpipe exits, it's is 1/4" thick.
• 3" two bolt flange is used on our 3800 downpipes, TOG headers, and Midlength headers (has 5.5" spacing between bolts).

Quantity discounts available. Contact customerservice@zzperformance.com