For 51mm Exhaust Pipe One Pcs Motorcycle Universal Exhaust Baffle Silencer Exhaust pipe and muffler assembly Insert DB Defender DB Killer Silencer

Good quality. Did it's job at quieting things down on a 1978 cb450. I just wish there was a bolt to secure it. Although I'm not using it with a slip on pipe and I think that's what the design is intended for.

Helped quiet my exhaust enough but not to quiet. Had to bend out to make it not come out the other end. Too small for my big exhaust.. For $10 it's good

For the price, this is a solid, well built muffler baffle. I ordered two different types as I'm trying to reduce the noise of an aftermarket muffler, a straight through, on a used motorcycle I recently purchased. I'm not a believer in "Loud pipes save lives", and feel they tend to anger others. Neither seemed to really fit my configuration, without some cutting and welding, so I'm still playing around with alternatives. I may still use it, but currently unsure. UPDATE: I have now used it at the straight through mufflers exit opening. It was a little small for the opening, so I made some cuts around the flange and bent the resulting tabs out to fit. Stuffed the muffler ID with metal scouring pads, then screwed this db killer in. Have finally reduced the noise to a much more tolerable level, even without earplugs. Have seen a slight increase in gas mileage, a reduction in backfiring, especially on shut off.

This works as it should. Used it on a minibike engine setup and reduced the noise by alot.

I was excited to get this product seeing all the great reviews. I’m not sure those reviews for fake or real but my silencer came in measured at 47mm. 4mm shorter than advertised. It’s a joke. When the price is too good to be true, it usually is.

Works great out this on my Zs190cc exhaust tip & got it exhaust to the sound I was looking for, definitely quite it down to the point where it’s suitable for my ears & others

It fit perfect on my 2007 Yamaha r6 GYTR slip on. Made the bike quieter and gave me back some back pressure that was missing. It will not fit on the configuration they have it on the pictures, needs to be installed in the back of the exhaust.

This was awesome. I was skeptical at first and was worried how I was going to secure it in place but it was just plug and play pretty much. The sound was lessened but it wasn't too much that my bike is quite. Now I have a low rumble exhaust and doesn’t hurt my ears. It did it’s job.