I'll err on the side of Warp Ten here and say you may be better off planning to get a new catback system that is designed more towards eliminating drone.
OBX/Maximizer has a
catback system that is very reasonably priced on Walmart to match the headers you bought. From what I have read here on the forums and seen on
youtube it has little or no drone.
Quote:
Originally Posted by ZBrink
2) Adding mass/weight to the exterior of the mufflers (maybe the engineers of the forum can better explain this)
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Warp Ten alluded to this by mentioning resonant frequency. There will be vibration frequencies that make the mufflers give off excess noise. If you have ever turned a stereo up in a car and had the door start rattling, its the exact same thing. Its a combination of material type, thickness, surface area, and vibration frequency.
By adding mass to the large surface areas you change the amount of energy required to hit that resonant frequency. That can reduce or eliminate it through the vibration ranges it will see use at. In sound deadening (for car stereo example) this is done by adhering sheets of butyl to the sheet metal panels to change the overall mass. You probably couldn't use the same stuff for the muffler because of the more extreme heat.
Applying exhaust wrap to the muffler would achieve a similar effect, it is adding mass. Another option would be welding extra material to the muffler to reduce the size of the resonant zones and/or add mass.
Quote:
Originally Posted by ZBrink
3) Wrapping the mufflers in header/exhaust wrap (would this last long terms?)
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I think as long as you understand why the exhaust wrap could lead to corrosion and how to mitigate that, its an option.
The danger of exhaust wrap comes from it getting wet, and then holding that moisture against your system for a long period of time. Aside from the obvious things, like rain or puddles, moisture can also come from not allowing the headers/exhaust to get hot enough to force evaporation. There is moisture in the air, and some heat can cause that to condense inside the wraps. So very short errand runs can actually be bad if there isn't a longer drive to break those up.
The risk here can easily be overblown. If it gets wet, at first opportunity take the car for a longer drive to build enough heat throughout your exhaust system and force any moisture to evaporate. Starting the car and letting it idle won't be enough to do this, the engine needs proper load to build the correct amount of heat, and enough time for all the moisture to be forced out.
So consider your usage. Is it a daily driver? That might be a little higher risk if you expect to be driving it in the rain. Weekend cruiser? No problem, that is low risk.