Quality product. Didn’t do what I wanted… my exhaust had a “chirp” to it when I put these in. Took them back out and wrapped steel wool around the cone and put them back in. Sounds like I wanted it to. Not sure how long the steel wool will last, but we will see.

Exhaust sound reducer

So far good. I installed them on my airboat powered by a Lycoming 4 cylinder to meet law enforcement requirements, I have not taken the boat out yet, I hope they hold up.

Cone

Helped some, might add another

Exhaust come

Lowered exhaust sound to a tolerable level

exhaust cone

Another excellent product from ZZP quick shipping very well made and hard to believe a simple item like this does what it does but the difference was amazing the repair shop welded it into the Magnaflow catback on my HHR which was way too loud & there was an immediate improvement lowered the volume considerably and also got rid of the annoying drone at a certain rpm I'd highly recommend this product