2006 A6 Z51, looking to increase the sound of the exhaust over the stock system, but want more V8 sound without the internal passenger drone. Looking at SLP Exhaust System, 2005-11 C6 Corvette "PowerFlo", anyone have experience with this system or do you have other suggestions. The system listed above is $700.00 from Texas speed & performance. thanks in advance for your replies.

 

I'd like to hear about this as well...

 

heard some examples on YouTube, but have never been in a car with that exhaust installed

interested to hear more info

 

Tag

 

Had FlowMaster on a base 05 coupe. Horrible drone. Am running a stock Z06 and love it. I know this does not directly address the system you are looking at - but, I hope it helps you stay away from headaches and carrying an extra bottle of aspirin in the glove box.

 

You're NEVER going to get the traditional "V8 sound" with an LS motor no matter which exhaust you install....

 

The Z51 option won't make any difference regarding drone.

The only way to avoid drone with louder mufflers, is to use earplugs, or to shift out of the 1400-1600 rpm range. Some just have a more annoying drone than others.

The closest thing to what you're asking for is a bi-mode. Quiet and no drone in one mode, loud and drone in the other. Your choice with a push of a button depending on the mood you're in at the time.

 

I don't agree with this.

I have the PowerFlo exhaust (2007 coupe, MN6, Z51). Great sound - a little deeper pitch than NPP when open, about the same volume. The drone when I installed it was awful! Especially with a light load on the engine, in 6th, around 1500-1800 rpm.

I loved the sound of the exhaust, but when the drone kicked in, you had to yell at the passenger to be heard clearly.

I added Dynamat Xtreme to the hatch floor, to dampen the thin plastic, and then a layer of sound barrier (MadVettes insulation kit) to block sound from entering the rear hatch area.

A few hours of additional work, and about $80 for material (if you use ensolite for the sound barrier), and not only did I eliminate the drone, but the car is quieter. Later I added dampening and a sound barrier to the doors, and now the car is less noisy than my wife's Golf. The exhaust sounds good when you get on it, but there's no drone, and less road noise than there was.

The problem with low pitched exhausts is they create vibrations in the body panels, which add to the volume of the exhaust. Both sounds then get amplified by the horn loading of the rear hatch, to create drone. Just a perfect storm.

I wouldn't recommend the PowerFlo if you're worried about drone, and aren't willing to do the additional noise deadening work. But if you like the sound, and want a quieter car to boot, PowerFlo with noise dampening is a good way to go.

 

So does the Powerflo have "better" sound than the regular stock? When you say its as loud as NPP when open, is the NPP at its loudest when open?

 

Stock is designed to be pretty quiet, and it is really tame. The PowerFlo has a low pitched output, for a nice rumble, with a little popping on deceleration. A LOT more character than stock - much louder overall too, but not too loud.

NPP has bypass valves. When the valves are open, the exhaust bypasses part of the sound dampening in the muffler for a louder output.

You might want to post on your regional forum - there's probably a forum member locally so you could take a listen.