Full 3 inch exhaust: to load on a 87 300SDL? - PeachParts Mercedes-Benz Forum

latitude500 · #1 08-11-2010, 06:08 PM

So my muffler is no more, so I just have the stock exhaust on my car now, but it's starting to rust out. So I'm in the market for another exhaust. I really want to do a 3 inch straight pipe from the turbo right out the back. No resonator no muffler.

Do you think it will be to loud? I've had one indy shop price me $550 for a custom 3 inch from turbo with flex pipe, res and muffler. What do you think about that price.

4thesporty · #2 08-11-2010, 06:48 PM

load=loud ????

When I drive a luxury car, the last thing I want to hear is the exhaust. JMHO.

Renntag · #3 08-11-2010, 07:05 PM

Quote:

Originally Posted by latitude500

... I really want to do a 3inch straight pipe from the turbo right out the back. No res no muffler.

I do as well.

Quote:

Originally Posted by latitude500

Do you think it will be to load?

I guess you mean "loud", check out you tube videos, there are many that show Turbo Mercedes with straight exhaust. The turbo acts as a muffler. Other than some interior drone under load, it wont be terribly loud. Neutral to off throttle, it will be quiet.

Quote:

Originally Posted by latitude500

I've had one indy shop price me $550 for a customer 3inch from turbo with flex pipe, res and muffler. What do you think about that price.

"Customer 3 inch? "
Save the factory flange from the turbo. Cut the flange off the stock head pipe. Cut off the hangers from the stock exhaust and have a 3" "off road" system made if you cant do it your self.

Get pics and video to share.

tbomachines · #4 08-11-2010, 07:18 PM

$550 sounds extremely expensive to me for just a bent up straight pipe with hangers. It shouldn't be too loud either, many folks have gone this route.

Renntag · #5 08-11-2010, 07:30 PM

Quote:

Originally Posted by tbomachines

$550 sounds extremely expensive to me for just a bent up straight pipe with hangers. It shouldn't be too loud either, many folks have gone this route.

That was not what he siad the $550 was for.

Quote:

Originally Posted by latitude500

I've had one indy shop price me $550 for a customer 3inch from turbo with flex pipe, res and muffler. ....

Hit Man X · #6 08-11-2010, 08:03 PM

Do not expect to pick up any power with this.

Jeremy5848 · #7 08-11-2010, 08:14 PM

The turbo will provide some back pressure but a straight pipe that large won't add much if any, compared to the stock exhaust. I would want to hear from someone who has experience on a dyno with such a mod before I messed with anything. I know it's hard to believe, but the factory engineers quite often do know what they're doing.

Hit Man X · #8 08-11-2010, 08:20 PM

I drove my SDL with an open downpipe for a few days while locating a used factory downpipe back exhaust. Noticed zero loss of power when it was attached. But I did notice a great drop in sound so I could hear myself think while driving again.

I suppose there can be some drop in EGT with it, but marginal at best. The thing makes 143hp new, that 2.25 or 2.5" downpipe is really just not restrictive.

FWIW, when I replaced the exhaust on my 300SEL with another factory setup, I cut up the factory stuff... it was basically like a Magnaflow style. Not a reverse flow like you used to find on old pickup trucks in the 80s.

DieselPaul · #9 08-11-2010, 08:38 PM

Less restriction on the turbo should allow for faster spool times. When my car is running right I'll hack the muffler off and let you guys know how it goes.

pawoSD · #10 08-11-2010, 08:54 PM

My car has a 2.5" straight pipe, while a bit "loud" it is not as loud as you think it would be. And it sounds sweet at idle.

Can hear the turbo spool/whistle clearly. It is not loud enough to bother me while driving 90 miles a day at 75mph.

And contrary to people's opinions, it does result in a bit of extra torque off the line, as the turbo spools faster. My car is just a bit faster than all of our other diesels for this reason. Heck, from 0-30 its faster than my 300E!

Renntag · #11 08-11-2010, 11:25 PM

The only purpose the exhaust system serves is to move the gases out the rear of the car, and to do so quietly. The turbo is just as happy with a short piece of pipe directing the flames away from heat sensitive bits.

I think that a 3" straight exhaust from the turbo back, out the rear of the car would be cool. The turbo sound will be awesome.

pawoSD · #12 08-11-2010, 11:31 PM

Quote:

Originally Posted by Renntag

The only purpose the exhaust system serves is to move the gases out the rear of the car, and to do so quietly. The turbo is just as happy with a short piece of pipe directing the flames away from heat sensitive bits.

I think that a 3" straight exhaust from the turbo back, out the rear of the car would be cool. The turbo sound will be awesome.

I think it sounds better on the 5Cyl 617 than it does on the 603 though, has a more rugged truck-sound.

tbomachines · #13 08-12-2010, 01:05 AM

Quote:

Originally Posted by Renntag

That was not what he siad the $550 was for.

My mistake, still seems on the high side if using off-the-shelf generic stuff though.

Renntag · #14 08-12-2010, 01:09 AM

I agree with you.
Maybe they use special EPA approved tubing.

Lowflyingbird · #15 08-12-2010, 06:41 AM

I'm getting the turbo system from a 99. I have all the stainless elbows and tubing to run 3". I previously had a 99 E300 with no muffler and there was a noticable change in performance when the muffler was cut out. Like mentioned the spool up time was shortened and manifold/ turbo was noticably cooler. It was not loud at all, but had a nice more performance sounding tone. I bought the 3" piping for the 99 but never got a chance to install. So, now it's going on the 96. Knowing the sound difference the cut out muffler made, with the cat. converter remaining on the 99. I plan on using a 3" stainless Magnaflow XL at the tail on the 96 to take the edge off the sound. If the Mag. muffler is not suffecient then I have a couple Vortex stainless perforrated header race cones, I can use one at the tip.