They come with allen key bolts on each of the pipes if you speaking about the Ixil L3X hyperlow.
If you allowed, they also come with a cat in the pipe as it comes from 2 to 1.
It is very loud when you remove all of that.
I had mine tested at 2 different places and it registered 101db
Hope that helps.
I meant to say that you can remove the Cat cone if you allowed in your country and that will make the pipe crack really loud on throttle.
You will also see on the inside of the shorty that they placed another 2 seperate DB killers that can be drilled out as well if you have the tools.
Apologies to all who would like to keep the noise down.
My dealer will be mounting this one, so im not going to have the catalyzator removed - only the db killers at the exit will be a possibility at some point ... thanks for the info dude!
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