I had a exhaust with like 4inch (out) and it make a lot of noise with the rest of the exhaust 2.25. I saw on internet silencer for exhaust. I live in canada (montreal) and cops are real bitch with this and I want to know if it realy reduce the sound and if its easy to remove. I plan on headers and hi flow cat so it going to be worst. So i think maybe its a good idea, isnt it?