Does anyone know what the stock resonator size is? I know it's 14" long but wasn't sure how wide (diameter) it is... 6"? 7"?

I have a 2008 IS250 with F sport axle back and just replaced the 2nd cats with bottle resonators but still have a drone on the highway so I'm now replacing the resonator with a magnaflow straight through muffler just need to know the fit size...

Any factual help would be appreciated.