Last year, I was rear-ended, and the guy ran off. I chased him down, but he had no license plate, and my tank was nearly empty.

So I bought this 304 stainless midpipe off ebay. It came with the wrong kind of connector, so I was stuck with putting my stock muffler back on, which sucks. It's a 2.5" pipe and is a direct replacement for the stock pipe.

Now, if I have my friend machine me a flange with his CNC machine, am I going to need to buy a short length of extra tubing? The muffler section that I want to put back on is a Greddy SP for my 99EX. Are pipe dimensions (i.e. 2.5") ID or OD measurements?

Thanks.

 

it's smaller than 2.5". just measure it. they advertise 60mm so thats probably OD

 

What should I use to measure? This sounds like a stupid question, but I've dealt with a lot of inaccuracy measuring circular objects with tape before.

 

Vernier caliper is perfect or if you wrap string around it and measure it against a ruler you can mathematically figure out the OD.