One local S4 has Ott X-Over and it still sounds too muted for my taste. I would try both X-Over and RMB with S4/GTS resonators. If it's too loud, you can always get rid of one or other in here or eBay not losing that much $$$.

 

It would certainly increase your HP and give you a beefier exhaust. I would certainly go for it. If you determine it is too loud, you may be able to replace the resonators with a Borla exhaust.

 

Garth,

I have the GT cams also in my GTS. I currently have a completely stock exhaust but, I'm looking into a possible exhaust change. Do you also run headers? If so, whose? Are you coming down to DEVEK DAYS?

Thanks in Advance

 

I do not have headers. I was considering the Devek Level III (1.75" to 3") but have not done that yet. I am not going to be able to make it to Devek. I was planning on getting away, but work issues have precluded that option. Louie Ott will be down. It is his exhaust that is on my car. I would look him up and chat with him about the exhaust possibilities. We have a great deal of respect for him here in the NW.