318iS Stromung Catback Group Buy 2015

[WhatWentWong]

OCell, just gonna chime in here and tell you there is NO donut there. The outlet of the cat (if it's still original) is bulbed which fits well with the flare from the inlet of the Stromung. When I installed mine I used factory parts and things fit with no issues. If both ends are flared then your stuff isn't all OE, and yes a donut would be in order. FYI the red car in the OP's photos is of my install.

You are misleading yourself by looking at another exhaust that is for the M20 dual pipe set up. Both pipes in that case require donuts, and even then one is different from the other to take up the manufacturing tolerances between the two pipes. Your single pipe M42 has no such issues so don't get distracted.

http://www.r3vlimited.com/board/showpost.php?p=4235005&postcount=77

The Bosal 256-737 I ordered isn't working, at least not on the Magnaflow system. I've got serious leaks. I've e-mailed Magnaflow asking what gasket I'm supposed to be using with their system.

The Bosal is what's listed at AutoZone and Amazon for the 318is, so I'm guessing it will work on the stock system, but I have no clue or way to verify.

[Ocell]

^man i thought I was crazy for being the only person with leaking issues (at the cat/muffler connection) from the group buy last fall but it's good to see it's not just me. I'm going to pick one of those donuts up and get it in the car in a week or two and see if that helps.

The Bosal 256-737 I ordered isn't working, at least not on the Magnaflow system. I've got serious leaks. I've e-mailed Magnaflow asking what gasket I'm supposed to be using with their system.

The Bosal is what's listed at AutoZone and Amazon for the 318is, so I'm guessing it will work on the stock system, but I have no clue or way to verify.

[Merlin8]

It took a week from when I got off the phone with them and them to get notification that a shipping label was created. Then another week till it arrived. Mine bolted up perfect no fient issues.

[Gunner_1886]

Have a charge on my card for the exhaust, but nothing in the mail and no contact from Stromung. Called them several times, haven't gotten a response. Anyone else still waiting?

[Merlin8]

Can you do a drive by clip?

Finally drove the car around after messing with the fitment twice. See video above for sound. I got clearance of the muffler tip to the valence by bending the hangers and also tightening from rear to front. I'm still pretty angry the fitment wasn't easy as a common bolt-on exhaust. I've installed many after-market exhausts before on different cars this one took a lot of adjustment. I'm still leaking a bit at the slip-joint. Still feel exhaust gas around the joint. Why couldn't they make it 1 pc or a flanged connection? I've changed positions multiple time and torqued down on it a lot but still a leak. After driving it around the sound made up for it. But as for fit, the stromung gets a low score.

[BraveUlysses]

^man i thought I was crazy for being the only person with leaking issues (at the cat/muffler connection) from the group buy last fall but it's good to see it's not just me. I'm going to pick one of those donuts up and get it in the car in a week or two and see if that helps.

[Ocell]

Also disappointed to hear the fitment issues, though I couldn't tell on mine since the PO cut the valence for a dual tip muffler and I installed a DEC cat at the same time as the Stromung.

For those who installed a new cat with their unit, did you ever source one of the donut gaskets between the cat and muffler sections?

I dug through the crate of donut gaskets at my local auto parts store and found one for a Jeep that was the correct inner diameter (2.25") and looked like it would work. I had to leave that night for the track so I had to give it a shot. I think it still leaks, it's too thick and the angle doesn't match the flange.

I found the part number for what should be the correct gasket (the BMW dealership was no help, I think they consider it a part of the cat assembly) and ordered it from Amazon. I'll get it later this week.

http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1


The exhaust shop put black RTV on my slip joints to try to fix the leaks. That either didn't work, or I've got a cracked exhaust manifold or bad gaskets between the manifold and the head. I have a very loud sputtering leak. My old exhaust was swiss cheese, so it's hard for me to track it down.

I may have the shop cut out the slip joints and weld it up once I'm certain I've got everything fitting correctly.

[boxy30]

Also disappointed to hear the fitment issues, though I couldn't tell on mine since the PO cut the valence for a dual tip muffler and I installed a DEC cat at the same time as the Stromung.

For those who installed a new cat with their unit, did you ever source one of the donut gaskets between the cat and muffler sections?

[CB-M3]

Finally drove the car around after messing with the fitment twice. See video above for sound. I got clearance of the muffler tip to the valence by bending the hangers and also tightening from rear to front. I'm still pretty angry the fitment wasn't easy as a common bolt-on exhaust. I've installed many after-market exhausts before on different cars this one took a lot of adjustment. I'm still leaking a bit at the slip-joint. Still feel exhaust gas around the joint. Why couldn't they make it 1 pc or a flanged connection? I've changed positions multiple time and torqued down on it a lot but still a leak. After driving it around the sound made up for it. But as for fit, the stromung gets a low score.

[jrobie79]

not hitting the valance on mine...i believe in was in GB #2

[Ocell]

I took mine to an exhaust shop because I was tired of trying to get things to work while laying on my back under the car.

After we loosened, rotated, and tightened the assembly a couple times with no real luck they ended up heating the pipe right before the muffler until it was red hot, then pried the muffler sideways until it was sitting centered.

[CB-M3]

seems like others are seeing it hit the valence as well. wonder why this was not addressed during the 1st run or maybe those people didn't have this inteference. I will try the rear to front method and report back.

[FL318is]

got mine on today. sounds great only issue im having is the exhaust is touching the valence on the left side how do i adjust this? its making a rattle sound

Mine was doing same thing. I readjusted but still had some rattle.

I found a used coolant system hose and cut washers, donuts from it. Inserted them in the 4 hanger attachment points. No more vibration noise.

[CB-M3]

I installed mine this morning. The muffler tip is off center so I will need to bend the hangers a bit. Had to retighten the pipe clamp cause i had a leak. Will post video shortly.

[Merlin8]

I got notice of pack slip for ups. I'm assuming since it was made late Thursday and they are closed Friday, that it will be shipped beginning of next week.