CMB .45 Quiet Pipe Question?

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I bought a brand new CMB Quiet pipe from a friend this weekend and I want to confirm that it is a .45 size before making it a used pipe. The overall length is 16". The widest point is 1.94" diameter and the long muffled end is 1.5" diameter. Is this a .45 pipe? Going to try it on my NR 46 because I want to be under 82 db.

Also, inlet i.d. is .712". Stinger i.d. is .345".

Thanks.

 

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Its a .45 pipe but I would open that stinger up. .375 will do the job

Cool, thanks!

I noticed the diameter of the divergent cone was larger by .2" than my NR muffled pipe, so I wondered. But the length of the divergent cone is exactly the same. My NR 46 muffled pipe works well, but I need to be super quiet next year. Db's ranged from 85 to 89 with the NR muffled pipe. Pretty good, but I want to be under 82 db. It's a different design than the NR 21 Quiet pipe. I'm starting to learn there are muffled pipes and then quiet pipes. I've seen NR 21 Quiet pipes run as low as 77db.