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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > HKS Exhaust + Catless DPs = Drone :-(



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      08-12-2012, 08:44 PM   #1
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HKS Exhaust + Catless DPs = Drone :-(

So I just installed an HKS Exhaust along with a Hotchkis X-Brace and I'm a little disappointed with the way it sounds...
I had AA Catless DPs on before with the stock exhaust and I really liked the way it sounded. But I came across a great deal on the HKS and it seemed to be the only thing the car didnt have(bedsides a single turbo kit ) so I was like what the heck lets do it! So I got it and put it on.
I have to say fitment was PERFECT! And the Titanium Tips compliment my car really well but... as soon as I started driving it I immediately started hearing drone!
If I put the windows down it obviously gets better but I rarely do that, I live in South Florida, 90% humidity year round
Maybe I need to drive it a little and it'll sound better but I'm really not too excited about it :-/
I'll keep you guys posted if it gets any better... I might look into High-flow cats, we'll see i guess.

Meanwhile here is a pic I took with my phone of the finished install

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      08-12-2012, 08:59 PM   #2
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Swap out for BMW Perf Exhaust
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      08-12-2012, 09:02 PM   #3
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Hi J, the vibrant resonators may help. At least a little. Unfortunately most of the dual muffler setups R drone city, but have been toned with resonators. They are about 100 bux on amazon and another 100 to install.
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      08-12-2012, 09:05 PM   #4
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High flow cats should help. It will quiet it down too. I know there are some universal vibrant high flow cats on vrsf's website. 200 cell shouldn't be too bad for exhaust flow..... the factory secondaries are 600 cell, iirc.
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      08-12-2012, 09:11 PM   #5
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video of exhaust?
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      08-12-2012, 09:15 PM   #6
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How come the anti-flex plate doesn't have the HKS logo cut-out?
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      08-12-2012, 09:24 PM   #7
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Quote:
Originally Posted by NiVeDh View Post
How come the anti-flex plate doesn't have the HKS logo cut-out?
I said the same thing... its cuz its a early production exhaust that was never sent out with the "HKS" stamped/cut into it. HKS sent the previous owner the HKS logo bracket but he missplaced it :-/ Its OK ill just hit up HKS for one later.
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      08-12-2012, 09:28 PM   #8
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Are you sure that's not a Vanguard?
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      08-12-2012, 09:30 PM   #9
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Quote:
Originally Posted by jazze90 View Post
Are you sure that's not a Vanguard?
Nope its deff an HKS, I've seem both.
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      08-12-2012, 09:31 PM   #10
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Quote:
Originally Posted by JMARS View Post
So I just installed an HKS Exhaust along with a Hotchkis X-Brace and I'm a little disappointed with the way it sounds...
I had AA Catless DPs on before with the stock exhaust and I really liked the way it sounded. But I came across a great deal on the HKS and it seemed to be the only thing the car didnt have(bedsides a single turbo kit ) so I was like what the heck lets do it! So I got it and put it on.
I have to say fitment was PERFECT! And the Titanium Tips compliment my car really well but... as soon as I started driving it I immediately started hearing drone!
If I put the windows down it obviously gets better but I rarely do that, I live in South Florida, 90% humidity year round
Maybe I need to drive it a little and it'll sound better but I'm really not too excited about it :-/
I'll keep you guys posted if it gets any better... I might look into High-flow cats, we'll see i guess.

Meanwhile here is a pic I took with my phone of the finished install

Hey bud, certainly i disagree with it. HKS is so far the only after market exhaust for 335 e92 that doesn't drone AT ALL. i.e. there is no bassy sound which could create resonating in the cabin. You can hear the exhaust coming outside of the car def so quite when windows up similar to the stock exhaust. I just get mine installed last Friday and I can't love it more. I tried borla, akrapovic and eisenmann on my 335 and HKS is the only one that doesn't bother me. It is girl-friend proofed as she doesn't even notice that I have it on comparing to the stock exhaust.
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      08-12-2012, 09:35 PM   #11
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I have the same exhaust paired with VRSf downpipes and think the exhaust sounds great. Drone is expected with alot of the aftermarket exhausts out there, though there is variances with the amount in each. No matter what car you have, upgrade the exhaust and some drone may be expected. I notice that alot of the owners on this forum throw exhausts on these cars and think they are going to pur like a kitten. What did everyone think was going to happen by removing the cats? Sorry that the drone isn't your cup of tea. Many people do what you originally did, and just replace the downpipes and keep the stock exhaust due to the sound. The resonators do little to prevent it. It happens mainly when the car is under load. It all comes down to personal preference though. Maybe there is some type of alternative for you that will work. E90Company's suggestion to swap for the Perf exhaust may work. I hear it is just slightly louder than the stock exhaust. I stay in Texas but am currently in Delaware on vacation. There is a huge difference in humidity between the two but not sure if that changed anything with the exhaust note or drone...sounds the same to me.
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      08-12-2012, 09:36 PM   #12
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And btw, I have AFE DCI, AR design catless DPs on my car. It simply sounds fascinating..
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      08-12-2012, 09:36 PM   #13
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Quote:
Originally Posted by jclariel View Post
Hey bud, certainly i disagree with it. HKS is so far the only after market exhaust for 335 e92 that doesn't drone AT ALL. i.e. there is no bassy sound which could create resonating in the cabin. You can hear the exhaust coming outside of the car def so quite when windows up similar to the stock exhaust. I just get mine installed last Friday and I can't love it more. I tried borla, akrapovic and eisenmann on my 335 and HKS is the only one that doesn't bother me. It is girl-friend proofed as she doesn't even notice that I have it on comparing to the stock exhaust.
Yea but do you have catless DPs?
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      08-12-2012, 09:38 PM   #14
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I agree. Its a little drone-y at highway speeds. If you are 6at pop it in to DS and drone is gone. Its right around 2200-2400 rpms.

Just got this setup about a week ago. Love it.
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      08-12-2012, 09:41 PM   #15
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yea im 6at on highway i just use DS mode.
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      08-12-2012, 09:43 PM   #16
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I don't know what to tell you guys... LOL
I'm not going to take it off cuz it's not my DD but if it was I would deff.
Its fine it'll probably just take some getting used to. ;-)
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      08-12-2012, 09:48 PM   #17
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Quote:
Originally Posted by JMARS View Post
I don't know what to tell you guys... LOL
I'm not going to take it off cuz it's not my DD but if it was I would deff.
Its fine it'll probably just take some getting used to. ;-)

+1 Just give it a chance
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      08-12-2012, 09:51 PM   #18
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Quote:
Originally Posted by JMARS View Post
I don't know what to tell you guys... LOL
I'm not going to take it off cuz it's not my DD but if it was I would deff.
Its fine it'll probably just take some getting used to. ;-)
LOL, i can't imagine there is someone who is more sensitive to drone than I am. I could be wrong about your car but the drone you mentioned might caused by something else? any contact between the exhaust and the chassis?
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      08-12-2012, 09:52 PM   #19
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Give it a chance OR get resonators welded in somewhere -- Only real solutions for drone
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      08-12-2012, 09:52 PM   #20
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I have the HKS exhaust on my car with stock downpipes and I love the exhaust, best sounding from all the ones I've heard before. But I think it's to be expected that you'll have drone with catless dp's and an aftermarket exhaust. After all, people get drone with the PE and catless dp's and that's a semi stock exhaust.

That's why my goal is to save up enough money to get the AR Catted Dp's to compliment the HKS purrrr
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      08-12-2012, 10:04 PM   #21
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You're probably not used to it
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      08-12-2012, 11:33 PM   #22
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I have hks with aa too. You must be really sensitive to drone. I've driven a 08 gt500 that required ear plugs driving on the highway lol
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