Yup, andys choise is good.
OMPs ARE LOUD, having one and having mated with them on their 172s......quite farty at low rpm too.
H&S are well overpriced, they also hol gold like status by many, but arent heads nor tails over many other fabricators. They are good, but not that good.
All i can sayif it fits your needs then go for it.
as for taking away noise, you need either 2 huge or a few small silencers.