my car has hedman headers and I need to know what collector size I need to get .I plan to run 2 1/2 exhaust pipe .Do I need to get collectors 3 inch opening with a 2 1/2 reducer I plan to order som eon ebay I just don't wanna get the wwrong thing
Most headers for a sbf have 3" collectors, you need a 3" to 2.5" reducer. I'm also assuming these are long tubes? Shorties may have a different size collector, not sure.
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no bad dad tape measure isn't broken.the car has exhaust attached to the headers it wasn't something I put on the car so I don't really know how to tell what I have or need,is there a way for me to tell if its 3 inch or not if please tel me thanks
diameter = circumference / pi Wrap a string around the pipe, mark the total length. Measure the length of the string marks and divide that by 3.14. The thickness of the pipe will be negligible relative to your result. Your answer will either be closer to 2.5 or 3, and give you the diameter of the pipe/collector.
Measure the circumference of the collector then divide by 3.1416 (Pi) That'll get you close. If they're long tubes, they're probably 3". Some are 3-1/2. Shortys are mostly 2-1/2'
I looked the headman headers up online and it seems they came with 3 inch collectors I think you guys are right its gonna be the 3 inch,just didn't wanna order the wrong thing
