Rey
Registered Member
I had a 2011 4.6 which I installed a Magnaflow exhaust. I suspect the exhaust that Magnaflow will eventually make for the R-Spec will contain the same mufflers as the 4.6. Aftermarket mfgs. try to use the same muffler blanks for several applications.
My Magnaflow droned on lugging light throttle. I found it intolerable. I changed the Magnaflow "x" pipe, that replaces the OEM central resonator, with a Magnaflow "x" muffler. Exhaust was quieter, but drone persisted.
My final solution was to replace the rear Magnaflow mufflers with Dynomax VT mufflers. This virtually eliminated the drone. I drove the car for 20K miles with these mufflers and had no problems with them whatsoever.
Skywagon and I considered installing the Dynomax VT mufflers in our R-Specs. The bad news is it would be very difficult because the Dynomax VT with 2.25" intake/exhaust has an offset intake, which makes the install very difficult.
The good news is Dynomax uses the same basic shell for all exhaust diameter configurations. They just neck down the intake/exhaust from 3" to whatever size. My sense is the interior is identical. What this means is that some inventive person may be able to adapt a "larger" Dynomax which has central intake/exhaust.
Borla exhausts seem to have the same kind of drone.
The only other aftermarket mfg that has successfully addressed drone is Corsa. They only sell complete systems, and they are very expensive. They use a different technology than Dynomax. They match high/low frequencies. I thought about adopting Corsa mufflers, but contact with Corsa discouraged me. Corsa claims their mufflers are precisely configured for each application. I suspect this to be an over qualification; and that a Corsa muffler might work with any similar displacement motor.
I decided to do just the Motorsports Authority rear cats delete. It is simple, cheap and easily reversible. Sound increase is almost immaterial. It is hard to determine a power increase as one's "seat-of-pants" dyno cannot sense changes of less than 10%. My guess, based on Motorsports Authority's testing with a 4.6, is that the power increase is maybe in the range of 4-5 RWHP.
My Magnaflow droned on lugging light throttle. I found it intolerable. I changed the Magnaflow "x" pipe, that replaces the OEM central resonator, with a Magnaflow "x" muffler. Exhaust was quieter, but drone persisted.
My final solution was to replace the rear Magnaflow mufflers with Dynomax VT mufflers. This virtually eliminated the drone. I drove the car for 20K miles with these mufflers and had no problems with them whatsoever.
Skywagon and I considered installing the Dynomax VT mufflers in our R-Specs. The bad news is it would be very difficult because the Dynomax VT with 2.25" intake/exhaust has an offset intake, which makes the install very difficult.
The good news is Dynomax uses the same basic shell for all exhaust diameter configurations. They just neck down the intake/exhaust from 3" to whatever size. My sense is the interior is identical. What this means is that some inventive person may be able to adapt a "larger" Dynomax which has central intake/exhaust.
Borla exhausts seem to have the same kind of drone.
The only other aftermarket mfg that has successfully addressed drone is Corsa. They only sell complete systems, and they are very expensive. They use a different technology than Dynomax. They match high/low frequencies. I thought about adopting Corsa mufflers, but contact with Corsa discouraged me. Corsa claims their mufflers are precisely configured for each application. I suspect this to be an over qualification; and that a Corsa muffler might work with any similar displacement motor.
I decided to do just the Motorsports Authority rear cats delete. It is simple, cheap and easily reversible. Sound increase is almost immaterial. It is hard to determine a power increase as one's "seat-of-pants" dyno cannot sense changes of less than 10%. My guess, based on Motorsports Authority's testing with a 4.6, is that the power increase is maybe in the range of 4-5 RWHP.
I suspect my next purchase for exhaust (not for Genesis) will be the Dynomax VT mufflers. Maybe it's time for some on the wifes V6 Sonata
