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      08-10-2018, 12:23 AM   #1
RaysM3
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Experience with Dinan Free Flow Exhaust?

Looking for some insight regarding the dinan free flow exhaust. The exhaust just isn't loud enough for me and I am considering deleting the resonators but would like some feedback. If anyone has done something similar or exact please let me know! Thank You!
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      08-10-2018, 12:33 AM   #2
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Get an IPE, that's what I did
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      08-10-2018, 12:44 AM   #3
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Resonators don’t quiet down the exhaust much, they mainly just smooth out the sound waves (rasp). Either swap mufflers or remove cats (which break up sound waves better than resonators but not as well as a muffler).
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      08-10-2018, 05:00 AM   #4
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install the Dinan catless midpipe, if you can find one used like I did, along with the Dinan cans and you will be very happy!
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      08-10-2018, 08:53 AM   #5
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I must be getting old. I find the Dinan cans alone a perfect sound. Loud enough to wake the car up and pronounce itself as a V8. Loud enough to hear with a helmet on at the track. But not to the point where everyone can hear me from the back of their house. Or that it drones and takes over the cabin while driving on the freeway. Also doesn't smell of a catless system.
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      08-10-2018, 09:51 AM   #6
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I left the resonators and deleted the secondaries.
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      08-11-2018, 03:55 AM   #7
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Quote:
Originally Posted by dgoldenz View Post
Get an IPE, that's what I did
haha would love to do that, but I really like the black tips on the Dinan exhaust!
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      08-11-2018, 03:55 AM   #8
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Quote:
Originally Posted by wyatth View Post
Resonators don’t quiet down the exhaust much, they mainly just smooth out the sound waves (rasp). Either swap mufflers or remove cats (which break up sound waves better than resonators but not as well as a muffler).
Yeah I thought so, but I had a friend do resonator deletes on his ACM modded muffler and it made quite a difference.
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      08-11-2018, 03:57 AM   #9
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Quote:
Originally Posted by WingZeroX5 View Post
I left the resonators and deleted the secondaries.
I would love to delete the secondaries but do not want to deal with smog and potential loss of drive train warranty. Hoping to find someone that has deleted resonators on dinan exhaust as that is what I am leaning towards doing the most.
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      08-11-2018, 08:22 AM   #10
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Quote:
Originally Posted by RaysM3 View Post
Quote:
Originally Posted by WingZeroX5 View Post
I left the resonators and deleted the secondaries.
I would love to delete the secondaries but do not want to deal with smog and potential loss of drive train warranty. Hoping to find someone that has deleted resonators on dinan exhaust as that is what I am leaning towards doing the most.
You'll pass inspection

Drivetrain warranty? Its unrelated
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      08-13-2018, 12:14 AM   #11
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Quote:
Originally Posted by WingZeroX5 View Post
You'll pass inspection

Drivetrain warranty? Its unrelated
California Smog has visual inspects of all cats and yes modifying or removing the cat voids drivetrain warranty, well in my case that is.
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      08-14-2018, 05:14 PM   #12
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Quote:
Originally Posted by RaysM3 View Post
California Smog has visual inspects of all cats and yes modifying or removing the cat voids drivetrain warranty, well in my case that is.
What's unique about your case?
Yes removing/fiddling with cats is illegal in CA, but that is unrelated to your warranty.
Fiddling with any part of your car will jeopardize the warranty for that component or related equipment. Thus, your exhaust is probably no longer warranted, but your headlights are. BMW would have to demonstrate that your removal of the cats caused a drivetrain issue in order to deny a drivetrain warranty claim.
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      08-14-2018, 06:19 PM   #13
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when i installed my Dinan exhaust i also felt it was too tame. Once you put on an aftermarket X-pipe, the exhaust is perfect. I chose to run the Evolve X-pipe, which has no primary, high flow secondary, and resonators.
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      08-14-2018, 06:25 PM   #14
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Quote:
Originally Posted by RaysM3 View Post
Looking for some insight regarding the dinan free flow exhaust. The exhaust just isn't loud enough for me and I am considering deleting the resonators but would like some feedback. If anyone has done something similar or exact please let me know! Thank You!

If they have a matching X-pipe or whatever, get that. It will be designed to work with the mufflers and provide a nice sound. Simply hacking off resonators or Lego-building an exhaust with different vendors is what leads to those raspy noises everyone complains about.

It all gets back to the idea of an exhaust SYSTEM.
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      08-14-2018, 06:27 PM   #15
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Quote:
Originally Posted by RaysM3 View Post
California Smog has visual inspects of all cats and yes modifying or removing the cat voids drivetrain warranty, well in my case that is.

False. It is illegal to remove functioning emissions control equipment, and BMW certainly will not warranty an aftermarket exhaust, but it has no bearing on the warranty for the rest of the car. I can't believe that this idea still exists some 40+ years after it was clarified in the courts:
https://en.wikipedia.org/wiki/Magnus...s_Warranty_Act
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      08-14-2018, 07:40 PM   #16
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Quote:
Originally Posted by wyatth View Post
What's unique about your case?
Yes removing/fiddling with cats is illegal in CA, but that is unrelated to your warranty.
Fiddling with any part of your car will jeopardize the warranty for that component or related equipment. Thus, your exhaust is probably no longer warranted, but your headlights are. BMW would have to demonstrate that your removal of the cats caused a drivetrain issue in order to deny a drivetrain warranty claim.
thanks for all the replies! Unfortunately the warranty is not through BMW and is through carmax maxcare and they do not allow any modifications to the cat or else they will terminate my warranty. If there is anything I am missing please let me know as I would love an X Pipe!
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      08-14-2018, 07:41 PM   #17
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I am honestly considering hacking open the Dinan exhaust and getting a pipe welded straight through inside while keeping the canister.
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