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Fabspeed or Dansk bypass
any advice out there? I want to replace my cat with a cat bypass, should I get the Fabspeed or the Dansk bypass?
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Monkey Butt Forespin
Join Date: Jul 2007
Location: Cumberland, RI
Posts: 474
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Fabspeed. In fact, there was a used one on the classifieds here.
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Fred Hurder Jr For Tech Questions: '84 911 Carrera Cabriolet (US) Weltmeister Chip, Fabspeed Euro Pre-Muffler, M&K 1-in / 1-out Muffler 22 ERP /29 Sander Hollow T-Bars, Bilstein HD Struts / Sport Shocks ERP Poly-Bronze Bearings (A-Arms & Spring Plates), Stock Swaybars Turbo Tie Rods, '92 C2 5-Spoke wheels w/ 1" adapters, Drilled Zimmermans Yes, I drive mine as much as possible. If it's >32° & sunny, I've got the top down. ![]() |
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Registered
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Thanks I'll have to check it out.
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Member 911 Anonymous
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Go with Bursch CBP, it is cheap and you can go back to OEM if you don't like the back fire or need to smog.
My 2 cents
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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THE IRONMAN
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Why not a Bursch one....and I don't have back fire with mine....!
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1984 911 CARRERA RUBY RED TARGA SW CHIPPED-BURSCH CATBYPASS MONTY FREE FLOW EXHAUST <IN GAS WE TRUST> |
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Monkey Butt Forespin
Join Date: Jul 2007
Location: Cumberland, RI
Posts: 474
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If you want the cheapest, I think the Schnell ones were sub-$100 at some point, that's in the dregs of my memory anyway.
The fabspeed I think is nice because it acts a little like a resonator, and it's eye-candy when polished up. The welds on mine were nice, O2 bung, etc. I got their copper gaskets also. I swap it out for the smog test and with the coppers, I don't have to buy new gaskets every time. Only thing on the coppers, the hole pattern was slightly off, and I opened up one of the holes a little to make it work.
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Fred Hurder Jr For Tech Questions: '84 911 Carrera Cabriolet (US) Weltmeister Chip, Fabspeed Euro Pre-Muffler, M&K 1-in / 1-out Muffler 22 ERP /29 Sander Hollow T-Bars, Bilstein HD Struts / Sport Shocks ERP Poly-Bronze Bearings (A-Arms & Spring Plates), Stock Swaybars Turbo Tie Rods, '92 C2 5-Spoke wheels w/ 1" adapters, Drilled Zimmermans Yes, I drive mine as much as possible. If it's >32° & sunny, I've got the top down. ![]() |
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I'm with Bill
Join Date: Jun 2005
Location: Scottsville Va
Posts: 24,186
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X3 for the bursch
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Electrical problems on a pick-up will do that to a guy- 1990C4S |
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Registered
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First I was going to gut my spare cat, then get the Dansk, then the fabspeed, the bursch looks good too, I can't decide. What about power increase/decrease with loss of backpressure.
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Registered
Join Date: May 2000
Location: PA
Posts: 560
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The cbp is just a straight pipe but will save a few pounds, reduce the engine compartment temp and pop a little on deceleration. AFAIK, the Fabspeed is a pre-muffler which is a little more complex in construction and may or may not add a few HP, but is pretty polished stainless and costs 2-3x more. I went with the cbp.
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Registered
Join Date: Aug 2001
Location: SoBay, SoCal
Posts: 1,369
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Quote:
How much does a pre-muffler muffle or decrease sound, compared to bypass? How's a premuffler constructed?--kinda like a glasspak?
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Mike '86 911 coupe '85 BMW 535i '11 Cayenne |
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Monkey Butt Forespin
Join Date: Jul 2007
Location: Cumberland, RI
Posts: 474
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I saw no discernable difference on the dyno just replacing the cat with the premuffler, without making other changes that could take advantage of the more open exhaust.
Fabspeed's unit is a highly perforated tube down the center larger chamber, IIRC. It is open straight through the center with no obstructions.
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Fred Hurder Jr For Tech Questions: '84 911 Carrera Cabriolet (US) Weltmeister Chip, Fabspeed Euro Pre-Muffler, M&K 1-in / 1-out Muffler 22 ERP /29 Sander Hollow T-Bars, Bilstein HD Struts / Sport Shocks ERP Poly-Bronze Bearings (A-Arms & Spring Plates), Stock Swaybars Turbo Tie Rods, '92 C2 5-Spoke wheels w/ 1" adapters, Drilled Zimmermans Yes, I drive mine as much as possible. If it's >32° & sunny, I've got the top down. ![]() |
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Registered
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I replaced my OEM muffler with a Dansk Sport 84mm muffler and noticed a slight power decrease, once I leaned the system out I regained my power lose, thats why I'm concerned with backpressure and the right choice of a bypass. Once thats done I'll install a SW chip.
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Quote:
Lastly, I have a wideband O2 sensor setup right now welded in next to my factory o2. Is it possible to weld in another bung on this Danks or Fabspeed? T
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Tauran 1986 911 Carrera Targa 3.5L Supercharged |
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Registered
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The Dansk pre-muff is available @ performance products, I just ordered one. I would have ordered one from our host, but unavalable. Ive been researching which cat-bypass to install and I chose the Dansk because it is baffled. More backpressure, plus the O2 sensor bung is after the left/right heat-exchanger crossover instead of just the left HE side. I don't know if O2 sensor reading of one side (bank) or both makes a differance, but that should give DME a better reading to adjust mixture.
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Registered
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we will have M&K units ready next week and our host should be able to sell them right away. They will be competivly priced with the others and of course stainless and TIG welded
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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Registered
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Do you have any specs. or pic of the MK?
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Registered
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no pics yet and as for spec what exactly are you looking for? It will be the lightest on the market and all 321 stainless..
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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Registered
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So no one has replied to a preference for the Dansk. Anyone? I have a stock muffler and my cat is rusted out, thought i would do a Dansk pre muffler to keep some sound attenuation, but the fabspeed is much cheaper. Does it have any attenuation at all?
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Tauran 1986 911 Carrera Targa 3.5L Supercharged |
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I've done some searching on previous posts and what I have concluded is that
the Dansk pre-muffler mated with a sport exhaust gives close to the same Hp as a SSI system minus the cost and modification problem to include the heater system. I've had a Dansk sport exhaust on my 3.2 for about 4 yrs. now and the quality is above std. Thats why I orders the Dansk pre-muff, sould get it next week or so. I'll let you know how it turns out. |
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Quote:
where did you find 1 and how much?
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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