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#1
07-21-2012, 04:01 PM
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straight piping 300D 300SD
Anyone know if straight piping my cali. 300d will give me better gasmileage and power? And how should i go about this?
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800 
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#2
07-21-2012, 04:06 PM
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would it be better just to cut out parts of it out and weld some straight pipe in?
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84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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#3
07-21-2012, 04:14 PM
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I straight piped mine, 300sdl, after about two weeks I put a straight thru muffler on it. No real increase in power slight increase in mpg but a BIG increase in noise.
I took mine to a muffler shop and had them bend a new pipe from the center back. Mine was rusted with holes and patches. Good luck with it. There a some videos on YouTube that show benzes with straight pipes. Check them for sound.
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86 300SDL. 250,xxx on #14 Head. One eye always on temp gauge.  . Cruising towards 300K
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#4
07-21-2012, 04:28 PM
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On another Forum Forced Induction posted a pic of a cut away Muffler. It is simply an expansion chamber with Pipes going in and out of it.
If the Cali Car has the Trap Oxidizer it can be replaced with the so called Test Pipe.
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84 300D, 82 Volvo 244Gl Diesel
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#5
07-21-2012, 04:45 PM
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I have a straight pipe on my 300SD....it gives slightly better off the line acceleration as the turbo spools a bit faster, but overall not much different in terms of economy/performance. It does sound good however.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#6
07-21-2012, 08:32 PM
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I straight piped my car, there was definitely a big increase in power for me, across the entire rpm range. I just cut out the mufflers and welded some straight sections in. Straight piping reduces back pressure caused by the mufflers, which allows the turbo to spool more quickly, making boost at lower rpm's, and therefore more power at lower rpm's.
I also have my ALDA maxxed out, and boost adjusted up to 12lbs
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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual 1980 300SD Turbodiesel, project car, nearly ready to hit the street 1974 240D, New paint
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#7
07-22-2012, 02:43 AM
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Here is another way to straight pipe one.
Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#8
07-22-2012, 03:25 AM
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I just put a straight pipe on my 300sd. I just had a muffler shop cut the muffler off and put a pipe in its place. Its not much louder and I really haven't noticed an increase in power or mpg yet because I have not had it long. I noticed that when the old muffler fell and hit the ground tons of soot came out. I did also notice that it seems since my turbo spools up a little faster I see less smoke.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual
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#9
07-22-2012, 09:31 AM
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I straight piped and found that the turbo spooled up quickly and that the car sounded a bit sportier. More like a v8.
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I could not own any MB without the help from you...fellow forum members. 83 300td 207,XXX
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#10
07-22-2012, 09:52 AM
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Quote:
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#11
07-01-2013, 06:04 PM
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cut the muffler off this weekend to find that the flow was being restricted by carbon build up. Straight piped it and am really enjoying the improvement.
__________________
84 300sd 2.47 dif 360k 26 mpg needs lots of love given to me in pitty 89 civic hatchback auto 140k 33mpgs soon to be low to mid 40's been in the family since mile 1 85 300d with unknown knock. driven over 30k with knock and still going. sold for $800
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