Remus I think is a decent exhaust, it is a bit lighter weight and worst case does at least a few hp’s (Don’t know if 10hp as they claim) and the sound to me is very nice. Certainly much better than stock but probably not as well sounding as the KKS or Kreissieg (or whatever) but for $1,500 installed is fabulous!!!
Chips, are a few out there that claim to add about 20hb to as much as 56hp. I think 20 to 25 is more realistic and I would stick or wait for Dinan or ACS.