The (definitive?) Air Cooled Exhaust Thread

[Stew F]

Since we've had a thread on everything from What Clear Hose Do You Run On Your Washer Bottle, to What's The Best Oil To Lubricate My Door Hinges, I thought I'd start an exhaust thread.  The reason being that I'm half considering changing my exhaust a bit. 

What type of system do you run?  What headers, muffler, cat/cat delete, heating/no heating, outlets, basic configuration, yada yada yada.  What do you like about it, and what would you change about it?  Post a pic, sound grab, etc. 

Mine, on my 81 SC, is this.

• Stock 3.0 headers
• a cat (that's probably blocked to buggery)
• Magnaflow SS muffler with 1 in & 2 out.
• Chrome tips

 I like the sound of mine, but I'm not 100% sure I like the way it looks.  And as I'm thinking of RS style bumpers, an outlet change is probably on the cards.  It has quite a deep rumble at idle, a bit like a muscle car. 

[tazzieman]

The old SSIs and Monty muffler setup, because it is the only one that makes more power , or so I have been led to believe.

It sounds like an outboard or light plane , according to my wife. At idle , dirty sound (& dirty looks at the lights) , at speed - just the nice 911 snarl. And pops on the overrun, which I didn't hear with the stock set up. All good , IMO.

[MFX]

I am planning on modifying the factory 'hotdog' muffler, like some on Pelican have done with twin centre outlets. Looks the goods and by all accounts does the job.

[turboT]

 

[Raven]

I know these guys spent a small fortune on this cars rebuild and that it is fitted with a variram 3.6 ,,,,but i must say it sound great with the GT3 center muffler on it ..good throaty sound on idle and a nice clean note about when given a rev ..............

 

[Pork Chops]

^ lots to like there.

[clutch-monkey]

3.6 #1 in a 1971 911T

custom tuned length extractors (still cheaper than buying some from the states..) and fabspeed RSR muffler

3.6 #2 in a 1978 911 SC

full fabspeed rsr system
https://www.youtube.com/watch?v=ue6sclySTfk

[Philbee]

Yes, looking forward to this thread as I'm in the market for a muffler for me car! Thanks @Stew F u da man!

im thinking Monty!

[tazzieman]

im thinking Monty!

For inspiration (the Full Monty). It only looks this good once!

[Mike-S]

For noise, the setup @Simonk has on his car sounds great. While I'd love to fit the SSI's to release a few more ponies I can't really justify the spend required, however my car does need a bit more noise, it sounds like a washing machine. My thoughts are a decat pipe and Monty muffler, see what that gives.

[LeeM]

  50mm hole saw in stock muffler coupla times. Sorted  

[tazzieman]

For noise, the setup @Simonk has on his car sounds great. While I'd love to fit the SSI's to release a few more ponies I can't really justify the spend required,

I think it's the muffler not the SSIs that make the extra 2 hp. They are very well constructed mufflers and will my lifetime by the look of things. Is Monty still making them?

[JD86]

For noise, the setup @Simonk has on his car sounds great. While I'd love to fit the SSI's to release a few more ponies I can't really justify the spend required, however my car does need a bit more noise, it sounds like a washing machine. My thoughts are a decat pipe and Monty muffler, see what that gives.

My 3.2 has pre-muffler and Monty one in one out.  If we can get our hands on Simon's vid of us leaving Ironhouse Brewery we'll hear what it sounds like.  I'm keen to know too!

[Simonk]

This guy has the same exhaust as me. M&K 1 in 2 out, stock cat.

 

[BlitzKonig]

95 3.6 with custom equal length flat headers and single Magnaflow muffler with twin exit. 

 

 

[Pork Chops]

I think it's the muffler not the SSIs that make the extra 2 hp. They are very well constructed mufflers and will my lifetime by the look of things. Is Monty still making them?

Word on my street is the SSIs deliver well on mid range torque so won't show up on dyno hp numbers but are noticeable on the street butt dyno.  If you need heat they are a pretty good option.  They are expensive but they are also a good quality product and if your factory headers are rooted and you're breathing COs and NOs they represent great value.  On a 3.6 there is some debate as to whether they are large enough but my advice is the primaries are OK but the secondaries need enlarging.

Personally I doubt the rear muffler makes a lot of difference other than to make nicer noises, which is important but very different to alleged power gains.

Best advice I can offer is to take advice from those that know.  So performance workshops or Porsche exhaust specialists.  Not a random idiot from the internet.  Wait a minute...

[Stew F]

This guy has the same exhaust as me. M&K 1 in 2 out, stoc

Mad camera skills there. 

[tazzieman]

Always hard to get scientific proof , but I went off this post http://forums.pelicanparts.com/porsche-911-technical-forum/123931-monty-vs-dansk.html

Monty:
Nothing but a Monty will do. Go to http://www.************** Dave is very
knowledgeable about these things. Neither the Bursch nor the Dansk improve
the performance and nothing sounds like a Monty.

I spoke with Steve Weiner (Rennsport Systems) jan 2003 regarding this very
issue (SSI and matching muffler on a 3.0). His experience and testing with
dyno anaylsis showed the Monty as the hands down winner, producing 7+ hp,
where the others (Dansk Sport, B&B, Fabspeed) produced about 3-4hp more
than stock. The Monty is a quality stainless unit, which fits perfectly w/o
modification and is QUIET as well.

With the SSIs on a Carrera, with a Monty 2 in 2 out (3") muffler: The
Monty made a noticable performance increase over my previousely installed
Dansk 2 in 2 out, and the workmanship is beautiful.

Also according to Steve Weiner of Rennsport Systems, "the Monty flows best".

On an '88 Carrera, the sound of the Monty and Dansk is about the same, not
loud. The Monty definitely makes more power, by the seat of the pants dyno.

WCB has a Monty 3" single pipe muffler with SSIs on my 70 S with a 2.8 twin
plug. All stainless construction and nice fit and finish. Louder than
stock with a bit of buzz at about 2,000 rpm; a quality part.

The Monty is a fabricated SS muffler, beautiful workmanship, around $700.
I got mine from Steve Weiner at Rennsportsystems.com

[Pork Chops]

^ I've spoken to Steve several times and I'd rate his opinion.  So that's an endorsement from one internet random, of another internet random, in another country, so solid as a rock really .

[Stepo]

I spoke with Steve Weiner (Rennsport Systems) jan 2003 regarding this very
issue (SSI and matching muffler on a 3.0). His experience and testing with
dyno anaylsis showed the Monty as the hands down winner, producing 7+ hp,
where the others (Dansk Sport, B&B, Fabspeed) produced about 3-4hp more
than stock. The Monty is a quality stainless unit, which fits perfectly w/o
modification and is QUIET as well.

I originally had a Monty on my 3.2 that must have had an outlet that was close to 4" diameter.  The sound was amazing, you thought a V8 had rolled into the drive and I'm sure my neighbours were just as excited . 

I got droning and tried everything to insulate the cabin (dynamat, extra foam between the rear seat and engine) but it was still too load.

I have always had SSI's and moved to a Dansk, very happy with the change, still a nice note at idle or under full throttle but not ear piercing.

I have no doubt the Monty is a quality muffler but there are various models so do your research. 

[DHE11]

Hi Stew,

You've seen my collection of factory exhaust and headers/mufflers...

To be honest I don't think i can feel 2-10 HP so wont claim i could notice any real change, but from standard to 1, 2, 3 and 4 i saved about 25kg in the rear which was a goal and the lap times improved!!! Also improved heat mangement.

For a street car the power and return on investment will be negligible.... get what you like the look and sound of!!!

You are welcome to try items 1- 3....  I think you already have some bits   

1/ started off with factory 3.2 system with heat exchangers.

2/ Deleted cat and put in straight bypass with stainless 1in - 2out - sounded good, very low like Stepo said above, lots of burbling and overrun pops etc.

3/ got a set of 1 3/4 headers and into a 2 in 2 out system, much more of an air cooled growl, sounded like a Porsche again

4/ went back to 1 5/8" for more midrange and custom exhaust into Magnaflows with cross over

Whole system is now ceramic coated to reduce the heat on the oil tank to oil cooler rubber hose as with the IROC style headers its very tight fit near the oil lines. Also reduces engine bay temp and will never corrode!

pics of 4/ below

[Philbee]

 

I originally had a Monty on my 3.2 that must have had an outlet that was close to 4" diameter.  The sound was amazing, you thought a V8 had rolled into the drive and I'm sure my neighbours were just as excited . 

I got droning and tried everything to insulate the cabin (dynamat, extra foam between the rear seat and engine) but it was still too load.

I have always had SSI's and moved to a Dansk, very happy with the change, still a nice note at idle or under full throttle but not ear piercing.

I have no doubt the Monty is a quality muffler but there are various models so do your research. 

Drone with a monty... hmm, that's not good. Is that a common thing for the monty or the one you had? I'm thinking to get thy monty but if it drones, me thinks I might drop off. It was suggested I go for the M21. Which one did you have? Did it drone at 60, 80 only at 100 or at any constant speed? 

 

[Stepo]

 

Drone with a monty... hmm, that's not good. Is that a common thing for the monty or the one you had? I'm thinking to get thy monty but if it drones, me thinks I might drop off. It was suggested I go for the M21. Which one did you have? Did it drone at 60, 80 only at 100 or at any constant speed? 

 

Monty was on the car when I bought it, so I don't know what model it was.

The drone was at about 80km coasting.  It had an oversized outlet pipe so could have been an issue with custom manufacture.  I would seek further feedback before ruling the Monty out as I believe they are well engineered with good potential to increase horse power.

[Stew F]

This is making for some good reading. Keep it coming.  If I do change my exhaust because of the rear bumper change, I will probably get a 2nd hand one and modify it. I do like the 2 centre outlet style.  

Has anyone here used a hotdog style muffler? Wondering what it would sound like. Pretty loud I expect.

[Simonk]

Monty was on the car when I bought it, so I don't know what model it was.

The drone was at about 80km coasting.  It had an oversized outlet pipe so could have been an issue with custom manufacture.  I would seek further feedback before ruling the Monty out as I believe they are well engineered with good potential to increase horse power.

hey Stepo, was your Monty with SSIs? The Milo tin outlet may have something to do with the drone.... I had a Monty 1/1 and definitely didn't drone. Used to set car alarms off all the time though. Sorry, don't know what model but it would have been about a 3" outlet