Drone is that loud humming noise after you've installed your cool shiny new exhaust system around 1800 - 2200RPM depending on your final drive ratio. It's very annoying for most and will drive your girlfriend (or boyfriend) right out of the car. So what is it? What causes it? What can I do about it?

1. Anyone Who Has Purchased A Lethal Performance Catted X Pipe For Mac

Sep 01, 2010  true, but that was on a built engine with a supercharger IIRC. And the mac's are 1 3/4' versus most others that were 1 5/8' I personally have no. Jan 05, 2013  The Lethal Performance catted x is supposed to be set up for matching the MAC LTs because there is no other catted mid pipe in existence for the MAC LTs and I don't want to screw with O/R - too loud and don't want to screw with inspections being in a.

Drone is the word to describe a resonance phenomenon that offends nearly every type of material on the planet as a specific frequency range. What causes it? This sound frequency range is typically between 133 - 138hz for cars. This frequency sends the energy through the metal frame, body work, and everything in between (even seats in some cases) and shakes the molecules creating an awful humming sound.

What can I do about it? You can't really block this frequency range because it is a natural resonance frequency.

It will rattle EVERYTHING (even materials like wood and some softer materials as well). Dynomat in your trunk won't work. Dynomat on your floorboards or on the unibody underneath your seats won't work.

This range of 133 - 138hz is incredibly difficult to manage. The best way to address drone is with muffler design or resonators. The factory mufflers are specifically designed to not only block but also CANCEL these frequencies.

Some aftermarket designs such as Borla's and Corsa's offerings do the same job. Borla's design cancels out some of these frequencies as well as ensures that the sound energy is going out the tailpipes. Corsa's designs have an internal chamber that is of the correct length to cancel this frequency out using the laws of wave reflection. Designs like the Magnaflow Competition Catback that uses a 5'x14' resonator to attenuate the engine sound drone like a mad cow. Flowmaster American Thunder mufflers drone like crazy because they were designed to produce a specific sound that was focused on the outside of the car.

There's nothing wrong with this, it's just what the manufacturers decided to produce. If you have an exhaust system with one of these such designs and don't want to change your entire system, then a set of straigh through race mufflers such as Dynomax Race Bullets or Pypes M80 mufflers will give you some relief but may not completely eliminate the drone depending on your overall setup.

What else to take away from this? Remember, exhaust systems are exactly that: systems. They sound, flow, and benefit your engine setup the best when thought of as a whole and variables are taken into consideration under every circumstance. We should start a list of people's personal experience with their exhaust setup, and add a subjective scale on how bad their drone is.

My first setup: stock headers and cats, Magnaflow 3' after-cat x-pipe, Magnaflow 3' Street catback. Drone(1-10), 3. Worst at 1,900rpm. Current setup, 1 7/8' longtube headers, custom catted h-pipe, stock overaxle pipes with Pypes M80 mid mufflers, Borla S-type axlebacks. And don't let anyone tell you otherwise. But seriously, when choosing exhaust systems and parts, choose wisely and with the thought in mind that you might change something or how a change might affect your overall enjoyment of the car. I personally do not mind drone, but the longest trip I had in my 05 was about 2-1/2 hours so I can't be taken into consideration.

Worst case I'll just either put the windows down or turn the sound system up! I was thinking of going with these because of the straight trhough design and they probably are lighter than stock also. Outlaws drone like a PIG. Probably the worst I've heard in a long list of systems. But if it doesn't bother you, more power to you.

I wish I had that tolerance. My drone isn't terrible anymore but you can definitely tell that the car drones. It usually hits about 78'ish dB's inside the car if I slightly lug the engine while cruising at 1900RPM. When I had just the catback, it would hit about 81dB inside the car.

Idump free download for mac. I'd love to find out how loud its inside, do you know if there is an app for a Galaxy SIII? I mean how can I measure it??

Anyone Who Has Purchased A Lethal Performance Catted X Pipe For Mac

Can anyone verify that the BBK catted X-pipe (p/n 1638) will work with the Mac Ceramic coated longtubes? Been searching everywhere for a midpipe that will work with the Mac longtubes that I am installing this weekend and the only thing I have found that anyone has is the Mac O/R H-pipe, which I am not too thrilled about using. I would like to keep the car at a reasonable sound level, and if someone can verify that the BBK catted midpipes will work with the Mac longtubes then I will go with those. Thanks in advance. Thanks for the responses guys. Guess I will go ahead and install the O/R H for now for the time being, I have also thought about having a set of cats welded in to quiet it down. I like my car to sound healthy, just not obnoxious!