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Quote:
Originally Posted by Pstallo View Post
I have the M&K premuffler and can attest that it is excellent. 'Growlier' sound with maybe a few more decibels louder, but not much. I also like that it doesn't have that raspy, crackly sound that some cat bypasses have.
What muffler do you have?
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'88 Carrera CE Coupe, '60 MGA 1600
'86 RS tribute, '86 targa, '97 993 C4S, '07 997S, '86.5 928 S
Old 09-12-2017, 07:51 AM
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Having heard and seen these in person, M&K is really at that top tier level alongside Supersprint and such. Great products.
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1985 911 3.2 Carrera Coupe - Constant Project - 2550lbs
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Old 09-12-2017, 11:09 AM
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Does M&K still make the GT3 style muffler for the 993 Bischoff heat exchangers in an 80's G-body?
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Old 09-12-2017, 12:25 PM
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porschenut, I have a stock carrera 3.2 muffler on my car. To be honest, I want a dual outlet simply for the looks. The car sounds great with the M&K premuffler.
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Old 09-12-2017, 07:11 PM
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Hey guys,


I've ordered a set of 3.2 headers and the GT3 2in-2out muffler from Brian. I can certainly attest to his knowledge and top notch customer service.

I'll happily keep everyone posted as to the sound/growl that comes from this upgrade once they arrive and get bolted up.

After reading this thread I guess I need to email Brian and confirm the the muffler will be the next gen type to combat drone.
Old 09-12-2017, 07:37 PM
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Quote:
Does M&K still make the GT3 style muffler for the 993 Bischoff heat exchangers in an 80's G-body?
Yes we manufacture mufflers with Bischoff inlets to fit the 911 chassis. These are custom as not many are sold and some of the tailpipe configurations are not available due to design constraints.


Quote:
After reading this thread I guess I need to email Brian and confirm the muffler will be the next gen type to combat drone
Yes we have completed the switch-over so all dual inlet dual outlet fixed tailpipe mufflers now being produced are Gen VI and have the internal baffling that combats drone. I've got an SC that is used for R&D which has been tuned to enhance drone for the purpose of developing this product update. I'll be very glad when we're all done and I can tune it back into spec!
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-13-2017, 04:35 AM
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Great muffler, installed the 1 in 1 out on my 87 3.2 and 82 SC. Price was right, very nice build quality all SS, much lighter and sounds better than stock. With the 3.2, I had to grind down the thin lip on the CAT flange inorder to get a tight seal. Brian was helpful with my install questions.
Old 09-13-2017, 09:24 AM
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50 Pounds????Really???

Our Host is showing M&K mufflers weighing 50 pounds in "the details".

Is there any difference in back pressure, in your Gen 2 mufflers, (ones with less or no drone)??

I am curious as to the general relationship between "droning", "back pressure loss" and mid range "torque loss", compared to the "stock" exhaust.

I am not looking for numbers, but rather a general understanding of the dynamics, again, suing stock as a benchmark.

Thanks,
chris
Old 09-13-2017, 05:36 PM
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Stock muffler weighs 40 to 44 pounds and M&K is only 16 if I remember correctly. I had to cap one side because I couldn't put up with the drone. My wife still thinks the car is too loud but I like the sound of my M&K very much.
Old 09-13-2017, 05:46 PM
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50 pounds? Wow close to an order of magnitude incorrect. The heaviest muffler we make is the Rally 3 pipe with caps, pins, and 3 tailpipes it is still under 20 pounds. Single in single out for SC/Carrera is 10 pounds.

The severity of drone, just like sound preference, is in the ear of the beholder. Type of engine, displacement, timing, tune, fueling, and sound deadening all contribute. The baffles we added change nothing pertaining to back pressure or performance, they simply disrupt the organization of flow that leads to drone. Stock mufflers cork up the engine which enhances mid range torque at the expense of horsepower. If you drive like an old lady short shifting and never see redline then a stock muffler is better for you. There is no torque loss, only torque range shift. As the engine climbs through the RPMs there will be peaks of resonance that can become a drone when enhanced by lack of sound deadening in the engine bay, or cam timing, or tuning peculiarities. Headers also may contribute to the harmony. It's complicated. A single outlet system can drone under the right circumstances. Stock systems don't drone because they are quiet and have baffles and chambers everywhere disrupting the organization of flow.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-13-2017, 08:02 PM
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I have a 2 in 1 out on the way to me with a set of SSIs I bought from the classifieds. I had originally planned on the 2 in 2 out version. I prefer it for aesthetic reasons but the 2 in 1 out lets me use the rear valance I already have.

Is there any appreciable performance difference between the 2 in 2 out and 2 in 1 on an otherwise stock 3.0?
Old 09-14-2017, 11:31 AM
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The 2out can be used without cutting your valence.
I ordered a cheapo stainless 90 degree bend and shortened it so it is hidden out of sight but I still have the 2out eargasm...

Brian, you should sell shorter endpipes for people who do not want to cut or change the rear valence.
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Old 09-14-2017, 02:22 PM
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Dual out is mostly aesthetics, sound is a little louder performance stays the same. We have caps to cap one side if you are on the fence about going dual or staying single. We also offer full wrap fiberglass valances that can be custom cut so you don't have to cut your valance. Looks really good with the fixed tailpipe mufflers as there is no longer a hole on the driver's side.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-14-2017, 04:46 PM
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Quote:
Originally Posted by RarlyL8 View Post
Dual out is mostly aesthetics, sound is a little louder performance stays the same. We have caps to cap one side if you are on the fence about going dual or staying single. We also offer full wrap fiberglass valances that can be custom cut so you don't have to cut your valance. Looks really good with the fixed tailpipe mufflers as there is no longer a hole on the driver's side.
Thanks Brian.

A replacement fiberglass valance was the plan for the 2 out muffler but buying, fitting, and painting the valance is only going to add time and money to an already long and expensive project.

I saw a couple videos of the 1 out and it sounds great. If the 1 out is going to give me the same performance and weight savings, I'll stick with what I have. Maybe down the road I'll upgrade to the 2 out look I prefer.
Old 09-15-2017, 08:05 AM
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GT3 and Valence from M&K





GT# Muffler and Valence from M&K....not bad eh .
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Old 09-15-2017, 04:37 PM
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I just finished removing the exhaust to finish an a/c delete and I left off my rear valence. I am running a 1 in 1 out M&K. You really only see the junk hanging out if you bend down. At normal height just a little bit of the muffler. I like the look and save huge amounts of weight! (2.2 lbs)


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Old 09-16-2017, 09:50 AM
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Snitzler, if you paint the muffler black using VHT paint, you won't see it at all.
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Old 09-16-2017, 10:03 AM
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Quote:
Originally Posted by WJL911 View Post




GT# Muffler and Valence from M&K....not bad eh .
That looks the business! My SC has the same bumperett delete and plugs as your SC does. Maybe I can find someone local that would trade my 2-1 for a 2-2 that is too loud for their taste. Then I'm only out the added expense of the valance instead of selling my used muffler and buying a new one.
Old 09-16-2017, 12:59 PM
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Somebody in an earlier post asked about Dansk vs MK.

I have a complete Dansk stainless exhaust on my carrera 3.0. It is really great!

However, my friend had an MK ex on his Carrera 3.2. It is better.

Get the MK.
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Old 09-16-2017, 03:34 PM
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