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      06-19-2019, 09:47 AM   #23
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Quote:
Originally Posted by hz_diesel View Post
That was all i needed to hear, are your mid pipes resonated? Might just pay for the AR Design ones then and get resonated mids as well.
Damn ~ Thank you for sharing ~
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      06-19-2019, 10:24 AM   #24
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Quote:
Originally Posted by cryptz View Post
I'm specifically going with arm due to the resonators. I'll let you guys know how I make out.
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      06-19-2019, 10:52 AM   #25
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Quote:
Originally Posted by f82george View Post
had the same issue last week with it rubbing the aluminum underbelly bad fitment .. save your money
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Originally Posted by f82george View Post
It's close to it and it only will rub when they get hot after a few pulls or so .i believe the expand from heat a bit causing it to hit
The resonators are the make or break for these. Glad to know its like a hit or miss. They do offer full refund if there are fitment issues but then again its the labor cost of putting it on and taking it off. Anyway you can put heat resistant foam or something?

Does it at least sound good?
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      06-19-2019, 10:57 AM   #26
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From my perspective they are installable based on the pics. If they sound great I'll just slightly grind down The lip that they appear to be rubbing on in the provided picture if I find myself with the same issue. The mark on the dp in the above post looks like the dp is just barely catching the lip/edge of the aluminum pan slightly. I could round that edge down near the dp worse case.
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      06-19-2019, 11:01 AM   #27
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Quote:
Originally Posted by f82george View Post
It's close to it and it only will rub when they get hot after a few pulls or so .i believe the expand from heat a bit causing it to hit
Is that the stock exhaust or aftermarket? I have aa signature and my mid pipe wanted to raise my dps a little when bolted on. Wondering if your exhaust could be having the opposite effect
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      06-19-2019, 11:03 AM   #28
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It's is a oem exhaust
And no issues with new downpipes.
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      06-19-2019, 11:46 AM   #29
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Quote:
Originally Posted by cryptz View Post
weird, the aluminum underbelly is fairly far away from where the DP meets the exhaust at the flange, im having a hard time understanding how you could be hitting that.
The F80 M3 ARM Downpipes did not have the sufficient bend in them (on the longer DP) to avoid hitting the aluminum bellypan. I tried to go cheap and wound up spending double. I wound up Replacing them the same week with Quality Name Brand Downpipes that fit like a glove......
If someone does buy the ARM Downpipes they will most likely have to use some Spacers on the Aluminum Bellypan for proper clearance . I Would love to hear back from those that went ahead and ordered ....
Photo below of where they were hitting belly pan.
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      06-23-2019, 08:48 PM   #30
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i had no issues: https://f80.bimmerpost.com/forums/sh...4#post24948374
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      06-27-2019, 02:17 PM   #31
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Quote:
Originally Posted by f82george View Post
It's close to it and it only will rub when they get hot after a few pulls or so .i believe the expand from heat a bit causing it to hit
Yup, same exact spot mine were hitting. I Could feel the vibration in the steering wheel and gas/brake pedals. I had to use 1/2" spacers on bellypan so it would not hit. I removed them and replaced with Quality Downpipes a week later.....
I will say this.....
Resonated Downpipes sound much better than regular Downpipes.
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      07-11-2019, 10:41 AM   #32
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Subbed for resonated downpipes that fit out of the box.
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      09-16-2019, 05:36 PM   #33
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Well even after reading this thread I pulled the trigger on the ARM resonated pipes for our M2 comp. Called the company and asked about the rubbing of the belly pan and they are aware some may rub and they include spacers now of that is the case. Excited to see how well these fit and sound.
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      09-17-2019, 04:33 AM   #34
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Quoted from: https://www.armmotorsports.com/F80-M...pes-p/m4dp.htm

Our 4" resonators are installed in the perfect location to enhance the sound of your S55 without compromising the precise fitment of our M4 downpipes.

I guess precise is subjective however they do look like a good option
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      09-17-2019, 08:18 PM   #35
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Planning to install a set after my driveshaft recall is completed.
If they don't fit, I have a backup set of pipes waiting to go in.

Last edited by TheirThere; 09-20-2019 at 01:37 AM..
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      09-18-2019, 05:12 AM   #36
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I ordered and had them installed, few thousand miles on car and no issues
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      09-18-2019, 03:01 PM   #37
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Mine arrive Friday, curious how big are these alum spacers they are including for the belly pan.
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      09-18-2019, 03:17 PM   #38
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pmurray633 has them
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      09-19-2019, 08:17 AM   #39
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Quote:
Originally Posted by brad65ford View Post
Mine arrive Friday, curious how big are these alum spacers they are including for the belly pan.
1/4 inch
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      09-19-2019, 10:47 AM   #40
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Quote:
Originally Posted by hz_diesel View Post
1/4 inch
Thank you, was also thinking about connecting everything up including the rest of the exhaust and seeing If I could slight bend up this pipe in question with an exhaust jack, sounds crazy but doesn't seem like it needs much to move up a little
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      09-21-2019, 08:30 AM   #41
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Just an update, installed these pipes on my M2 Comp. Fitment was spot on, the added alum washer I didn't use, I reshaped the one spot in the alum belly pan slightly to make some room for the longer DP's. I'm impressed how quiet this off-road dp actually are, the resonator is doing its job and smell isn't nearly as bad as I thought it would be. Running BM3 stage 2 93 with AA mid-pipe and the sound to me is very good, no raspy crap which I didn't want, also lowered all the burbles way down . Not sure if the car needs to get used to the different dp's but it actually feels a little slower than when it has the stock DP's on as if it's missing the backpressure. Hopefully its all in my head. Regardless, these are worth the cost IMO.
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      09-21-2019, 08:55 AM   #42
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Quote:
Originally Posted by brad65ford View Post
Just an update, installed these pipes on my M2 Comp.
Thanks for the update.

Sound clip and pictures of the gap between the aluminum brace and the DPs?

How much louder would you say the exhaust sound increase is?

Didn't plan on going the down-pipe route on this car due to the rasp/sound increase but this has got me thinking.
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      09-21-2019, 11:07 AM   #43
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Didn't grab any pics but will, no sound clips either. I'm still surprised it doesn't sound louder than I thought I would especially with the AA mids.
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      09-21-2019, 02:13 PM   #44
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Quote:
Originally Posted by brad65ford View Post
Didn't grab any pics but will, no sound clips either. I'm still surprised it doesn't sound louder than I thought I would especially with the AA mids.
Awesome, it would be much appreciated. I have AA mid-pipe as well so happy that it doesn't sound too much louder. I have Remus axle-back and the AA/Remus combo sounds horrible with normal downpipes.
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