M&K race mufflers

[ninesixfour]

Anyone use them? Any dyno info out there? Also, how loud are they as compared to say, headers with megaphones? A sound clip would be great.

[TimT]

I have an early iteration of Bens 2 in 2 out.... it has no stuffing in it.. it sounds great!!! I dont have a sound clip though... I dont have any comparative dyno info... as Ive only driven my car on my dyno with the M&K muffler

I keep meaning to add links to Bens site from mine... maybe Ill do some website updates tonight.

[davec]

I have a Pete Weber Phase 9 and Phase 10 set up on my car. When I bought it I had 3 other set ups I was evaluating on a dyno. Pete's system actually made 10hp more than megaphones (basically straight pipes). And, since my home track, Lime Rock in CT, has a noise limit of 86 decibels, it had to be quite. I used to get black flagged every time they did a sound test. Last year I was at Lime Rock at least 4 or 5 times and never failed that test again. It's a little loud for the street when you are into the pedal heavy, but not if you like an aggressive sound. And, they are beautiful to look at, very well made, stainless steel. I have a 3 liter with PMO carbs.

I am in no way connected to Pete Weber. Over the last 6 or 7 years I have purchased several systems and even made my own from a Dansk. Pete's system is expensive, but it is the last system you'll ever need.

Dave C

[KTL]

jstein here on the forums tried Ben's shorty race mufflers. Really loud. He got pulled over by the coppers in his neighborhood and that was the end of them. Switched to a 2 in 1 out Bursch frankenstein- 2 in pipes from an old Bursch street muffler assembly with a glasspack bullet "muffler" attached to it. Still loud but doesn't violate track sound regulations nor does he get pulled over any more.

[David 23]

Originally Posted by davec

I have a Pete Weber Phase 9 and Phase 10 set up on my car. When I bought it I had 3 other set ups I was evaluating on a dyno. Pete's system actually made 10hp more than megaphones (basically straight pipes). And, since my home track, Lime Rock in CT, has a noise limit of 86 decibels, it had to be quite. I used to get black flagged every time they did a sound test. Last year I was at Lime Rock at least 4 or 5 times and never failed that test again. It's a little loud for the street when you are into the pedal heavy, but not if you like an aggressive sound. And, they are beautiful to look at, very well made, stainless steel. I have a 3 liter with PMO carbs.

I am in no way connected to Pete Weber. Over the last 6 or 7 years I have purchased several systems and even made my own from a Dansk. Pete's system is expensive, but it is the last system you'll ever need.

Dave C

Was the extra HP made with only the pahse 9s, or with the 10 installed also. Did the 9s alone make more HP than with the 10? Are you using his headers also?

[davec]

Extra HP was with Phase 9's only. I did not dyno it with the Phase 10 as I was borrowing them for the analysis, and the 10's were not available. After seeing how his muffler flowed, I purchased his headers as well. If you are going to use a different set of headers, make sure they are equal length primaries.

[patkeefe]

I have a short M&K on the turbo SC. It has a little stuffing in it. 3" straight thru, with a 5" can. I'd have to ask Ben if this is one of his standard builds.

Any, my girlfriend says she can follow my car around the Glen by the sound. It's a little loud when I start the car in the morning. Seems to work pretty well, however.

[ninesixfour]

Originally Posted by patkeefe

I have a short M&K on the turbo SC. It has a little stuffing in it. 3" straight thru, with a 5" can. I'd have to ask Ben if this is one of his standard builds.

Any, my girlfriend says she can follow my car around the Glen by the sound. It's a little loud when I start the car in the morning. Seems to work pretty well, however.

Got a sound clip?

[stownsen914]

Originally Posted by davec

I have a Pete Weber Phase 9 and Phase 10 set up on my car. When I bought it I had 3 other set ups I was evaluating on a dyno. Pete's system actually made 10hp more than megaphones (basically straight pipes). And, since my home track, Lime Rock in CT, has a noise limit of 86 decibels, it had to be quite. I used to get black flagged every time they did a sound test. Last year I was at Lime Rock at least 4 or 5 times and never failed that test again.
Dave C

Dave C,

Does the setup you use to pass at LRP use the Phase 9's, Phase 10's, or both? Is that the same setup that made more power than the open exhaust? Thanks.

Scott

[KTL]

Originally Posted by patkeefe

Any, my girlfriend says she can follow my car around the Glen by the sound. It's a little loud when I start the car in the morning. Seems to work pretty well, however.

A handful of us gruppeb idiots have the cheap version of your muffler (or lack thereof). It's called The Elbow and the "inventor" of it prides himself on being the most raucous sounding car on the track. Just like yours, you can always tell where Sir Elbow is on the track.

Here's him in front of me (silver 87 911)

http://www.youtube.com/watch?v=QHYwvfPwxFk

[davec]

Originally Posted by stownsen914

Dave C,

Does the setup you use to pass at LRP use the Phase 9's, Phase 10's, or both? Is that the same setup that made more power than the open exhaust? Thanks.

Scott

I have only used the phase 9's with the phase 10's. They are so quiet you can actually have a conversation (until you really get into it). It's the 5th system I have tried on the 3 liter, plus two other systems on the 2.7 liter. I just can't say enough good things about it. I don't have any more issues, don't give it another thought. That frees up time to concentrate on other things, like getting under a minute at LRP!

[patkeefe]

964, sorry no sound clip. Maybe I can get my daughters to help make one.
Anyway, I tried to build a quiet muffler last month...got a cheap Walker at the parts store, and welded on a 3" T04 flange and a tailpipe. It was quiet, but the car had no power and ran like crap. Never underestimate the loss of power through exhaust restrictions...


ktl, yes the Elbow is loud. I don't think mine is that loud.

[jgparker]

I've had a pair of the M&K race mufflers on my 911 for a couple of years, and I really like them. These are the very short soup cans that bolt right to the stock headers. The just pass the SCCA 103 dBA rule, but they sound great. Much less harsh than my old megaphones. Sorry, no dyno results, but here is a good sound clip at speed:



Good luck,

JP
--

[patkeefe]

Nice, JP
Susan says they are louder than mine.
Pat

[campbellcj]

I have a set as well, in a custom length to work on my 914-6. They are significantly quieter than megaphones -- I did a measurement but don't recall the results -- but still not really streetable. My hearing is already a bit impaired @ 41 years old so I figured my days of open pipes at the track were over. I have not done any dyno tests but they are still straight-thru pipes so I suspect would perform very similarly to regular megaphones.

[campbellcj]

Here is the pic from Ben's web site:



And the link:

http://www.mkexhaust.com/#

[Roger 911]

I have a pair of the M&K race mufflers on my '72 911. I think they look great and sound great. Well made too. Yes they're loud, but I have not had any issues with police or track officials. At idle or low revs, they're not that obnoxious (at least on my relatively mild 2.4). I should probably add that my car is essentially a track car. I probably would not put these on a daily driver...hence the description "race mufflers"!

[David 23]

Do you know if they come in different diameters? I saw some on another car at the track, and they seemed very small diameter.