I am thinking of replacing some or all of my OEM exhaust on my 95 as the resonator is about shot, The previous owner did a muffler delete, and the sound is reasonable, but the drone is pretty bad at 2000 to about 2800. So I was considering a chambered system with a cross pipe. Do any of you have any experience with this, and is the drone bad?

 

May not be the answer you're looking for... but in other cars where I've had this problem, the drone can mostly be eliminated by adding resonance canisters to the side of the exhaust.

Simple example... in the Crown Victoria... you had the HPP version (High Performance Package) and you had the P71 (Police Interceptor). Both of these had the same engine, and the exact same mufflers, though the police ones did not have resonators. Both are relatively subdued until you add a Cold Air Intake to the front of the engine... and that allows the resonance to become an obnoxious drone. Now, for the exhaust... the only difference between the HPP and the P71 were these little sealed cans that were bolted onto the exhaust. Two per exhaust side... one in front of the muffler, and one after the muffler.

Most Grand Marquis and Crown Victoria's from 1993+ came with a single exhaust... just because people didn't care and the old people aren't going to be flooring it. But they still had the resonance can located in front of the muffler. They were technically called "exhaust dampners." If you can find them, they would bolt in between the H-Pipe and the rest of the exhaust...



And here's an exhaust diagram with part numbers:



I'm not suggesting you have to get one from a Crown Vic... there are several trucks that come with these as well (GM included)... you could find one and bolt / weld it to the exhaust as an option... at least if you didn't want to have to completely replace everything.


Also... age has to do with it too... not the car, you. Haha... I'm 48 years old now, and a loud exhaust would have been awesome to me when I was in my teens and 20s, but I'm starting to like it less and less as I get older. Something more subtle with growl is what I prefer now. The days of glass-packs on an third gen Camaro / Firebird is not my thing anymore... haha.

 

VERY interesting, I can see where the resonance "could be" transferred as a frequency/vibration. The can would have to be tuned to the particular impulse for that engines size...Yes I am old 81

 

That's a lot more science than I think most people have considered who have re-used them... but it makes total sense. I know GM has them on a couple of their pick-up trucks... so possibly a thought there as well (with the SBC in it).

 

I have a High-Flow Performance chambered exhaust with x-pipe and resonators right before the exhaust tips. It does drone a little under a load when around town or below 45-50 mph. The drone goes away if I leave the transmission in Drive instead of OD. Corsa is the only company I know of that is "drone-free". I've never been in a car with a Corsa exhaust but plenty of forum posts are around testifying to the lack of drone. For what it's worth my factory exhaust droned a little at times too.

 

Yes the resonance will vary by design of the exhaust system you buy, but things like H or X pipes are there for just this reason. Corsa is just about the only performance one you can buy off the shelf that has almost none.

 

I just bought a system from Corvette Central which has what appears to be the compressions (chambered) spaced for the LT1 . So my 95 engine is a clone or as close as possible.. It do have a "H" pipe just before the long tubes, and I will have that changed to an actual "X" which i know will raise the octave a bit, and might do the trick. Will know in a few weeks.