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Porsche Crest Does size really matter?

Me again,

I am doing my EFI build up and have decided on a K27-HF2 turbo. Would it be a good move for me to take off my GHL Motorsports dual 3" out muffer and go to a single 4" straight through Magnaflow muffler?

I would run it from the turbo to the passenger side of the car so I have the straightest possible exit. I plan on running my wastegate pipe on the driver side and flare it up to 4" to match.

Just curious as I have heard the easier the air can exit a turbo car the better. Good idea?

Thanks for your thoughts.
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-23-2007, 10:44 AM
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My exhaust uses a 3.5" straight through muffler with a 2.5 to 3.5 taper off the turbo. It's VERY loud. I may try going from a 12" Burnsstainless muffler to a 17" to see if that's any better. If my neighbors still cringe when I drive by, I may go to a Fabspeed exhaust.
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2014 Cayman S
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1979 930 (475 rwhp at 0.95 bar)
Old 05-23-2007, 01:38 PM
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Opps, forgot the pic:

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2014 Cayman S
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1979 930 (475 rwhp at 0.95 bar)
Old 05-23-2007, 01:40 PM
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930s rule the wasteland
 
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good lord ! that just looks nasty
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 05-23-2007, 03:01 PM
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The least bends in the exhaust system, the better, especially for turbocharged motors. I run a straight through single exit Magnaflow Muffler, but it's 3" inlet/outlet. The sound is great and not too loud.

I think a 4" would probably be too loud for my liking, but hey, each to his own

125shifter, that IS nasty! Very nice
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 05-23-2007, 04:27 PM
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930s rule the wasteland
 
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my ex wife say size matters
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 05-23-2007, 04:46 PM
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Quote:
Originally posted by h20cooled7
my ex wife say size matters
Is that why she's now your ex? LOL!

Just kidding
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 05-23-2007, 05:32 PM
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Would you like a muffled light weight alternative?

I have been working closely with M&K the past few months to develop a performance 930 muffler made of 321 stainless steel that is a direct bolt-on with no valance modifications.

The sound level is just right for an aggressive street turbo. Your neighbors won't throw rocks at you but everyone will know you have something serious going on when you hit the key. The sound level disappears to little more than the whiz of a spooled turbo at speed. A HUGE added bonus - the entire unit weighs just 10 pounds! The exhaust path is an unobstructed 3" ID with a larger ID 180* switchback bend that smooths the flow to the stock outlet.

M&K has agreed to manufacture this unit and Pelican has given me a verbal to distribute it with the other M&K products. I would like to get a few units out in the field for some feedback before doing that.

Next week I plan to do a dyno run with this unit vs my stock Euro muffler. It passed the butt dyno with flying colors!


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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 05-23-2007, 06:52 PM
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If it exited off the passenger side I would love to try one out. I wish you made two versions. My wastegate pipe is going to be right where the one pictured exits.

Let me know if you have other options.

Thanks!
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-23-2007, 07:11 PM
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Exit out the passenger's side is easy. Ben made one for his car.
I have not tried that version on mine but would imagine it is louder.

I'll ask Ben if he has a jig for his muffler. If not I can fab you one and have Ben do the final welds. When do you need it (read - how much time do I have)?
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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 05-23-2007, 08:06 PM
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What kind of price are we talking about? Is 4 weeks enough time? Can it be done in 3.5 inch rather than 4 inch?

Thanks.
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-23-2007, 09:03 PM
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Quote:
Originally posted by RarlyL8
Would you like a muffled light weight alternative?

I have been working closely with M&K the past few months to develop a performance 930 muffler made of 321 stainless steel that is a direct bolt-on with no valance modifications.

The sound level is just right for an aggressive street turbo. Your neighbors won't throw rocks at you but everyone will know you have something serious going on when you hit the key. The sound level disappears to little more than the whiz of a spooled turbo at speed. A HUGE added bonus - the entire unit weighs just 10 pounds! The exhaust path is an unobstructed 3" ID with a larger ID 180* switchback bend that smooths the flow to the stock outlet.

M&K has agreed to manufacture this unit and Pelican has given me a verbal to distribute it with the other M&K products. I would like to get a few units out in the field for some feedback before doing that.

Next week I plan to do a dyno run with this unit vs my stock Euro muffler. It passed the butt dyno with flying colors!




I had mine fabbed just like the one in the pic. Sounds great

http://www.youtube.com/watch?v=kz7MzPVYB6M

Last edited by dewolf; 05-24-2007 at 02:16 AM..
Old 05-24-2007, 02:14 AM
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4 weeks is enough time.

The current design is 3" ID. To change to anything else would require re-tooling at great expense. Also as you know the larger the ID the louder the muffler. I chose 3" because it is the largest ID that will allow you to use a stock turbo flange and gasket while keeping the noise volume at an acceptable level.

The design that David is using is optimal for a performance application but unfortunately it may be too noisy for the subdivision police. It's all a compromise.

The entire unit is aircraft grade 321 stainless steel which is extremely expensive due to the Ti and Ni content, the very elements that reduce weight and increase durability. The cost for the unit pictured will be along the lines of Ben's N/A mufflers, around $600, cost will be less for a unit having a passenger's side outlet. I will get current materials pricing from Ben and sell the pilot units as low as I can. All undamaged units are 100% returnable if not satisfied, no questions asked.
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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 05-24-2007, 05:39 AM
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Nice! 3" it is. I guess going larger than what the turbo exit size is really would not matter on such a short system. Let me know when you have one ready and I'll take it. Will the finished unit be polished? Noise is not an issue with my car as it has Oregon "Special Interest" registration which means no noise or flame arresting requirements!

Can you also give me a price for a duplicate tip for the driver side as I want an exact match for a wastgate tip on the driver side. Only needs to be 8" or so.

Thanks Brian!
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 05-24-2007, 07:00 AM
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Quote:
Originally posted by RarlyL8
The entire unit is aircraft grade 321 stainless steel which is extremely expensive due to the Ti and Ni content, the very elements that reduce weight and increase durability. The cost for the unit pictured will be along the lines of Ben's N/A mufflers, around $600, cost will be less for a unit having a passenger's side outlet. I will get current materials pricing from Ben and sell the pilot units as low as I can. All undamaged units are 100% returnable if not satisfied, no questions asked.
That's not bad at all, I spent over $500 for material for my exhaust and it's not even 321.
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2014 Cayman S
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Old 05-24-2007, 08:06 AM
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Raw materials are terribly expensive. I am doing this because I truly enjoy it. Pricing will be kept as reasonable as possible.

Chris - We are producing Zorks and Waste Gate Dump Tubes as well. I may be able to fab up a Waste Gate dump for you depending on what headers you have and what valance you use. It would be done using my car for fitment. If it is not feasible to do that then I can sell you all the parts to simplify installation.
Polishing adds $100 to the cost.
If you could, please e-mail me a picture of your exhaust system and bumper/valance as well as a few words regarding your vision of how you want the entire system to look and function. That will tell me how to proceed. Thanks!
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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 05-24-2007, 08:53 AM
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RarlyL8:

How about a variation of the set up pictured above... straight pipe out of the turbo, 180 degree bend and out thru the stock valence opening? Should be a little quieter than a zork with similar back pressure, wouldn't you think?
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85 930
Old 05-24-2007, 12:19 PM
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Crotchety Old Bastard
 
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I'm not certain I understand what you are saying.
The above muffler pictured will exit the stock valance opening on the driver's side rear corner of the vehicle.
I purchased a stock bumper for fitment testing and can post a picture for you this evening. The bumper looks rather nasty so please bear with me on that one. The tailpipe was designed to tuck up even with the valance for a nice symmetry line when seen from the rear (as most cars will view a 930)
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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 05-24-2007, 12:34 PM
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Brian,

Picture your new muffler / exit pipe without the muffler. Basically replace the muffler with a straight piece of tubing.
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85 930
Old 05-24-2007, 12:50 PM
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Quote:
Originally posted by Stephen B
Brian,

Picture your new muffler / exit pipe without the muffler. Basically replace the muffler with a straight piece of tubing.
The guy who done my exhaust did that, and HOLY CRAP what a noise. It was pretty unbearable at WOT. I could'nt live with everyday, nor could the cops I'm sure. Sounded like a Harley 10 fold. So we put a muffler in there.
Old 05-24-2007, 03:05 PM
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