omp stainless group n exhaust

i need a new exhaust for my project and can get a omp stainless one quite cheap has anyone ever had or know someone with one or heard one just wondering if they are any good and how loud they are as dont want anything to loud just after a slight burble and cant really afford something like a powerflow custom made one

Not sure about the group n but the group a basicly sounds like you aint got an exhaust  

This ones possibly a group n?

cheers mate see what you mean about the group a sounds like its fallen off lol

This ones got no exhaust or downpipe and sounds about the same as that group a

https://www.youtube.com/watch?v=rq9MCHqKkIA

My exhaust is an OMP but don't know what type... Sounds pretty standard.