Borla exhaust for R-Spec... should I do it?

[scottdk]

The below muffler may be just the thing. But will it produce the dreaded drone?

http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=9287

I have 2 MagnaFlow mufflers, but both have the inlet and outlet on opposite sides, enabling correct fitment. There is a little bit of drone, doesn't bother myself but would bother others.

 

[Skywagon]

Scott,
Did you do any other work to the system besides the mufflers?
Thanks

 

[scottdk]

Scott,
Did you do any other work to the system besides the mufflers?
Thanks

I only did new tips from MSA and the two mufflers. Total cost with install was $320.

 

[Skywagon]

Part of the install problem on the 2012 models is the rectangular holes in the bumper for the exhaust. Also, the stock mufflers have a rectangular flange on them that fills that hole to a great degree so one cannot see the muffler. Of course anything is possible if one's check book is thick enough.
One thing I forgot to mention is we totally removed a muffler when the resonator was still on the car. I was amazed how much sound the resonator eliminated. Perhaps another resonator where the stock muffler is would be enough?

 

[Rey]

Skywagon, I am sorry you could not fit the Dynomax mufflers. I am also sorry I may have misled you respecting the fitting.
Nevertheless, I pick up my RSpec next week in Kansas City, and I have Dynomax mufflers in my garage, which I will try to fit. I had to cant them about 60 degrees from vertical in my 2011. The mufflers are slightly visible from the side, so I painted them flat black which caused them to almost disappear. I too am troubled about just how to fit the round rear pipe to the rectangular hole in the rear fascia.

 

[Skywagon]

Rey,
Relax, you didn't mislead me in the least. As you know there is a cavernous area behind the rear wheel wells for the stock mufflers, and I still like the Dynamax VT mufflers. Their size is good. Unfortunately, and there were three of us standing there scratching our heads, two pros and me; the only way we could seem to get it to work would be if the entry and exit holes were on the same side of the muffler as in the above link. Part of the problem was because we planned on using the stock pipe almost up to the muffler. We determined if we did that there would have be a very dramatic 90 degree bend fabricated just in front of the muffler. Also, that same bend would start to get very close to the rear suspension parts. Another problem is fabricating the mounting flanges on the new mufflers to marry up with the stock car mounts. If one can over come these problems cutting the cosmetic flanges off the back of the stock muffler and welding it onto the new could be an option. Of course, again, it depends on how thick your check book is. I'm pleased with the sound I'm now getting. Obviously some may not be so happy. I'd recommend doing the cat and resonator deletes first and then go from there.

 

[Rey]

Skywagon. I need some clarification please. The #17155s have an offset inlet and a center outlet. Are you saying it would fit better if both inlet and outlet were centered? Or, are you saying that an entirely different configuration is needed: one with the inlet and outlet on the same side of the muffler?
If what is needed is just a center inlet/center outlet then #17092 may be the answer. It has the same case dimensions at the #17155. I compared the #17155s that I have still in the box with the 2.5" #17156. Cases are identical. The only difference is the necking down of inlet/outlet.

 

[Skywagon]

Rey,
I'm saying both the inlet and outlet of the muffler need to be offset. That allows most of the muffler to go up into the area where the stock one is and also allows a more straight meeting of the outlet with the rectangular bumper hole. The below link shows what may work but it's not a Dynamax VT muffler with the movable interior valve. I looked at Dynamax's web site and they don't make a muffler with both holes offset.
Hope this makes sense.(?)

http://www.magnaflow.com/02product/s...e=main&id=9287

MY APOLOGIES FOR THE DOUBLE POST, ABOVE LINK DOES NOT WORK, BELOW LINK DOES?

 

[Skywagon]

Rey,
I'm saying both the inlet and outlet of the muffler need to be offset. That allows most of the muffler to go up into the area where the stock one is and also allows a more straight meeting of the outlet with the rectangular bumper hole. The below link shows what may work but it's not a Dynamax VT muffler with the movable interior valve. I looked at Dynamax's web site and they don't make a muffler with both holes offset. Magnaflow's part number is 11375
Hope this makes sense.(?)

http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=9287

 

[Skywagon]

One thing I forgot to mention. The cat deletes are designed for left or right side, stamped accordingly, due to slight differences in the plumbing. MSA makes a quality product, came with all nuts, bolts, washers and gaskets. Also easily fitted.

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[Rey]

It seems to me that if one is to delete the rear cats and the dimple restrictions, the most expedient solution is to just cut out dimples and extend new pipes up to where the rear cats mount.
I don't think I will delete the central resonator because it does not produce a lot of back pressure and it internally contains a balance pipe. The balance pipe seems to mellow sound a bit. Were I to delete the central resonator I would replace it with MagnaFlow's "X" muffler. My research shows a minor power increase over a simple balance tube.
I am going to try to fit the Dynomax VT mufflers because I like their sound and performance. A second choice is Corsa mufflers, which use completely different technology to eliminate drone. Corsa mufflers are very expensive; they seem only to sell complete systems; and they do not offer a system for the Genesis. However, they do have an upgrade system for Corvette who want a quieter "touring" sound under part # 14162 or #14169. The cheapest price I have been able to find for this conversion system is about $390 from Katech. It may be a dice roll using Corsas as they my be tuned for a particular motor.

 

[motorsportsauthority]

One thing I forgot to mention. The cat deletes are designed for left or right side, stamped accordingly, due to slight differences in the plumbing. MSA makes a quality product, came with all nuts, bolts, washers and gaskets. Also easily fitted.

Thank you so much for the kind words. First off, it's been very hectic around here, and I want to apologize to the members that I've been absent from the forum. I do want to mention that thanks to Rey, we've remade our jigs to where we distinguish a L and a R.

It's nice to see that quite a few of you have stayed active. I'm trying my best to stay on top of these R-spec vehicles. They're real nice, in my opinion, but we don't get a lot of them at our local dealership. So we're a bit restricted on our access to these vehicles. Our Genesis Coupe V6 turbo project has taken priority over all the other work I've been trying to do on the sedan, including our R&D with the BC coilovers. I'm hoping to get back on it ASAP, and who knows. Maybe the Gen coupe v6 will fit on the sedans. Thanks to everyone for the support.

 

[Skywagon]

Rey,
Sounds like a good plan to me. As I wrote, we took one muffler off the back of the resonator and started the car. I was amazed how much sound the resonator eliminated. Please keep us advised with the Dynamax mufflers.
Thanks

 

[FrostCS]

Anyone who has removed the stock resonator know the external dimensions?

I know it's recessed on the top for the drive shaft, so I am kind of doubting being able to squeeze the 6x12x22 x-pipe resonator in there without it sticking down too far.

Thanks

 

[Skywagon]

I cut mine out and if you really want the dimensions I'll get them. However, the stock resonator is straight through with a connection between the two sides. Not sure you wouldn't be wasting money cutting it out only to replace it?

 

[FrostCS]

I cut mine out and if you really want the dimensions I'll get them. However, the stock resonator is straight through with a connection between the two sides. Not sure you wouldn't be wasting money cutting it out only to replace it?

Hi Skywagon,

If it's not too much trouble to measure it up it would be appreciated. If you'd have to dig it out of the trash then I wouldn't worry about it.

I am replacing the exhaust with slightly larger piping and starting at the cats getting the size increase as well.

Threw the car up on ramps last weekend and noticed the resonator looks a bit like an H pipe, just recessed on the top. So it was hard to get an accurate measurement laying on my back with it 2 inches from my face.

Just trying to prevent unbolting it all just to drag the exhaust out from under to get some accurate measurements!

Thanks!

 

[Skywagon]

Frost,
They say a picture is worth a thousand words...perhaps you'll agree? FWIW I went to Borla's web site and I couldn't find an application for the R-Spec.
Regardless, it appears the resonator is 16.5 inches long seam to seam. Plenty of plumbing on either side. Duh, forgot to get the width, sorry. Hope this helps, let me know if you need more.

 

[FrostCS]

Thanks Skywagon!

It looks like the width may be only 10 or 11 inches, I might be pushing to get something with a 12" width. Will have to check the return policy before I place an order.

It's a bit tricky finding exhaust components, let alone full systems for these cars since the rear muffler area behind the wheels is so large yet short and awkward at the same time!

 

[Rey]

FrostCS,
Consider replacing the central with an "x" pipe. MagnaFlow furnishes a simple X Pipe with their Genesis system. They also have an X muffler/resonator which fits nicely in place of the OEM resonator. I had this X muffler on my 2011.
Do research on benefits of the X pipe concept. It is well known that a balance connection tends to mellow exhaust sound. The X pipe takes it another step. A lot depends on the application, but what I have read is that the X pipe produces some minor torque increases.
DynoMax produces several VT muffler applications with pipes ranging from 2.25" to 3.0". The body of some of these mufflers measures 14"; and all these 14" mufflers use the same shell with a basic 3" inlet/outlet that is necked down for 2.5" and 2.25" applications.
Skywagon and I tried to fit the #17155 which has an offset inlet/center outlet. We both independently decided fitting would be almost impossible.
It may be possible to fit the #17962, which has center inlet/outlet.

 

[Skywagon]

Rey,
For what it's worth, I finally installed a balance pipe between the two exhaust pipes where I removed the resonator. The raspiness, rapping or some may call it tininess, has been cut dramatically. I find it odd that such a small mod would make such a difference but it certainly has.
Merry Christmas