I'm still thinking the tailpipes are the place for the resonators. That might be tough for you on the right side pipe. There still might be room if you can come out of the top of the right pipe just after it goes over the axle and 90 to the left before it hits the bed. On the left pipe, you could come out of the side of the pipe easily.
Here's a pic of mine taken from just behind the left rear tire. Again, I have a single 3" tailpipe. I used 2 1/4" pipe for the resonator, but I don't believe diameter is critical within reason. I bought the 304 stainless flex tubing from carparts.com, $35 for 5 feet.

 

Murphdog, your setup hasn't changed right? Have you tried taking the resonator off, and testing back to back the noise level when driving? Im just wondering how noticeable of a change you are getting out of your setup.

 

TS77, no nothing has changed other than I changed the original aluminized setup to stainless and replaced the hose clamps with Torca clamps. The pipe diameter and length remain the same and both the aluminized and stainless versions work equally well. I have not taken the resonator off since I put it on. Noisewise, I don't believe the exhaust volume changed at all after I put the resonator on. The resonating noise I had at 1600-1700 rpm, however, is completely gone...no resonance at any rpm or load now.
I wish I knew the answer to how this works on other than a single muffler/single tailpipe system, but I don't. I know the Mustang guys reported success with two 24" resonators on their tailpipes.
Before I bought the Magnaflow system I have now, I had a local muffler shop put on a single in/dual out welded Thrush muffler and dual tailpipes. It droned bad as well and I thought about experimenting with the resonators on it, but didn't. It was too loud and the noise it made when switching from 8 cyl to 4 cyl was really obnoxious. I cut it off after a week once I had the new Magnaflow system. Besides, it looked like a 4th grader had done the welding. I doubt it would have lasted a year before it fell off.

 

So has anyone done this with any luck? Planning on running a spintech on my sierra crew cab and am curious about this. Would be running a single 3" in/ dual 2.25 out and thought about doing the 3" T-pipe before the muffler with approx 30" of pipe length (for around 5000 rpm peak drone. Any thoughts?

 

I'm still messing with it. I haven't got it to work with it before the mufflers. I'm gonna try to do it after the mufflers and see if that works. I just need to figure out how long to make them to kill the severe drone I have from 2200-2700 now.

 

You had it with the cutout, right? Seems to me if it has direct exhaust flow, it would cause resonance in the tube itself. I would try it at 90* and see if that helps any...

 

Thread Revival Time!!!

I am going to be giving this a shot in the near future. I am running true dual, through a dual 2.5 in/out 18" Magnaflow. I will have to read this a few more times to figure out proper length. Anyone have any pointers that they have figured out?

 

I was just gonna dig this one up again, Just the other day a redid my resonation pipes and made them after the mufflers in the tail pipes and 90* to the the pipes. Currently, they are about 26" long. Bad news is still didn't fix it I don't think they're long enough still, so I'm gonna add 6" to them and see what that does. I did invest .99 cents into a tool to test it with though, I bought a decibel meter app for my iPhone so I could measure the dB in the cab and compare before and afters. So right now, it measures 75dB at 2000rpm, 82dB at 2500, and 76-77dB at 3000. That 7 dB is HUGE in the cab. So I'll try longer and shorter and see if I can tune out the drone

 

What if you made the pipe sleeved so you would have infinite adjustability? Might be hard to get a good seal between the pipes. Trying to figure that one out.

 

Mine are, the end pipe can slide in and out of the flex tubing if I loosen the clamp. It's got about 8 inches of travel. I'm gonna spend some time trying to "tune" the drone out of it, but if it doesn't work, I'm going to yet AGAIN change my exhaust to a 4" with a stock Dmax mufler.