I know how to solve most problems like drone but I have never heard of a buzz unless its a rattle, but it is all welded and I didn't have this problem until I took out the resonator and installed the cherry bomb extreme, considering putting a resonator back on... I don't want to sound dampen it but that rattle buzz sound sounds just ridiculous.my suggestion is to go with a properly engineered exhaust system with the muffler and resonator size. I have been down the road of trying to develop my own exhaust system using universal mufflers and resonators. It took a number of attempts before I got rid of all the pieced together systems and bought one that worked. For the Fiesta, I decided against anything other than a well designed exhaust system and it worked great. Trying to pick the right resonator and muffler based on the sound wave frequency when you don't have any good way of collecting data is very hard. The best you can do is try to match a system that has already been developed. With the Borla/FRPP system, I bought it and had it on the car in 20 minutes. No more trying to guess what length and diameter resonator will work with the frequency wave or what muffler goes with it.
Here is a little history of what I tried over the course of 5 years on my Focus ZX3 before I got it right;
stock header, flex pipe, with custom flex-pipe back section and Apexi N1 muffler
4-2-1 header, stock flex pipe, with Apexi N1
4-2-1 header, stock flex pipe, Apexi N1 with Apexi in-tip silencer
4-2-1 header, 2.25" flex pipe, Apexi N1 with silencer
4-2-1 header, 2.25" flex pipe, Dynomax resonator, Apexi N1 with silencer
4-2-1 header, 2.25" flex pipe, Magnaflow catback
4-2-1 header, 2.25 flex pipe, longer Magnaflow resonator, Magnaflow catback
4-2-1 header, 2.25 flex pipe, Vibrant catback
4-2-1 header, 2.25 flex pipe, long Magnalow resonator from earlier attempt, Vibrant catback
4-2-1 header, 2.25 flex pipe, SVT Focus cat-back with custom flex pipe attachment (finally fixed the drone and volume problem, but sold the car a few months later)
All of that money, time, and effort thinking I could fix the terrible drone and high volumes when what the car really needed was something engineered by people with all the right equipment and tools.
I will start a new one and there isn't much clearance and I do have a videois the rattle sound coming from the exhaust hitting the heat sheild? How much clearence is around the exhaust and the sheild? Without a sound clip, it is very hard if not impossible to diagnose.
Since this is a collection of sound clips, it would be ok to start a new thread to diagnose the buzz issue.
Então, acho que é do Brasil?
this is my car with a custom exhaust
Miltek EVO 4-1 header
2.25'' - 2'' reduction
Hey that sounds pretty good, more mellow than I thought it would be, guess my mind was stuck on the word Flowmaster, smooth sound, I would like an interior video at about 45 to 70 (oh that's right, Jersey, scratch the 70 lol) Do we have to have the resonator?? Wonder what just the Flowmaster would sound like. Oh, your score:
With Glasspack as resonator and Flowmaster 44 Muffler.
Interior video to follow.