Back in this thread (post #7) I promised kfrog some info about what muffler I was putting on my exhaust system so decided to make a thread for it.

Goal: Free flowing yet quiet exhaust to let the 855T breath. Mostly wanted to get rid of dreaded midrange drone. Got inspiration from boxpin's work in this area; hopefully he'll chime in with his experiences. The stock exhaust is nice and quiet but quite restrictive; esp if you're going to do some mods to push more air.

Seems lots of guys mod their exhaust to make more noise than stock; not my goal at all! Kind of outgrown that and going for the sleeper look anyway. I even got the steely wheels on there; except for the turbo badge on the tailgate, it looks like a N/A going down the road.

Started calling local exhaust shops: only one did mandrel bends, he was way expensive, and he couldn't build the downpipe. I don't weld so I was down to few options. I priced it out and this made the most sense for me; here's my parts list:

1. OBX kit EX11111
2. OBD2 3" cat (keeping it smog legal 49 state) magnaflow 99009HM
3. Dynomax VT muffler 289-17956
4. Magnaflow resonator 642-10416

Above came to about $700; about another $250 in labor from local shop to install (i installed the OBX system; they welded in the other pieces).


I had to drive on the OBX (with the cat installed) for about a month. Definitely free flowing but much too loud IMO! So just got the other mufflers installed this past week. While much better it's not quite as quiet as I had hoped. Mostly concerned about the drone (2k to 3k rpm when pulling a hill); while greatly reduced, it's still there. Maybe i'll add wrap later but we'll see. Didn't notice any difference pwr-wise between the straight OBX and adding the mufflers.

pics to come in next post..

 

some install pics:

 

couple more.. OK, one more; upload is not working..

 

Good work! I've been waiting to find someone who has installed a free flowing quiet system. Although I might be wishing for the best of both worlds. Keep us posted and thanks for sharing your experience.

 

Looks great, how about a sound clip?

 

Here you go; can't tell much from these clips IMO. I mean if i was to just listen to this clip, it sounds almost stock. But it is a bit louder than stock; esp inside the car.

Again, much quieter than original obx system, but i would like to get rid of the drone that's still there when under load in the 2500 rpm range.

Boxpin; what do you think of another resonator between the cat and VT muffler? I've read a few posts that point me in that direction. E.g. this one: http://www.matthewsvolvosite.com/for...318320#p318320