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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 Review on E92



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      04-25-2009, 12:36 PM   #1
riceygts
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HKS Exhaust Review on E92

I just got this piece installed at Bavarian Exclusive. I have to thank Bobby for the wonderful service, awesome price and Duy for the smooth install.

Some initial impressions:

1. The fitment was 100% dead on.. everything lined up perfectly with no issues whatsoever. You can tell they put in their R&D time.

2. The quality of the exhaust is top notch, as to be expected from a company like HKS. From the packaging materials to the exhaust itself.. It put a smile to my face. They even include a tool to plug up and properly hide the exhaust flap vacuum hose.

3. The sound is intoxicating when pushed, but barely noticeable when at partial throttle (no drone at all). While cruising with my windows up, I can hardly tell that I've added an aftermarket exhaust. (keep in mind I have catless downpipes too!). This system is one of the quietest exhausts I've heard on this car.

4. The titanium burnt tips look pretty nice.. but that is subjective. I would think the burnt blue color would match nicely with a montego blue car.

5. I can not comment on the gains as 10-15hp is hard to feel via butt dyno especially after feeling the addition of a JB3. Grassroots motorsports magazine did do a comparison test on 335 exhaust systems (which included AE and HKS) and the HKS came up ontop with +13hp.







Here is a video of a cold start. My other mods include Injen DCI, AR catless downpipes, and JB3. The rattling sound only happens from a cold start.

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Last edited by riceygts; 04-25-2009 at 01:01 PM.
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      04-25-2009, 01:08 PM   #2
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Does anyone know the weight comparison between these and the factory set up?
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      04-25-2009, 01:27 PM   #3
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It looks and sounds great! But $1,600 still is pretty pricey..
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      04-25-2009, 01:50 PM   #4
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sounds great! hks exhausts are awesome!
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      04-25-2009, 02:41 PM   #5
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Exhaust sounds great!
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      04-25-2009, 05:01 PM   #6
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sounds nice. i still think im goin for the meistershaft race though. this almost changed my mind. nice exhaust though. good sound and looks!
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      04-25-2009, 11:58 PM   #7
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Quote:
Originally Posted by hotrod182 View Post
Does anyone know the weight comparison between these and the factory set up?
The difference is at least 20 lbs.. I held the stock one and that thing is a pig!

Last edited by riceygts; 04-26-2009 at 11:39 AM.
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      04-26-2009, 04:26 AM   #8
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Quote:
Originally Posted by riceygts View Post
Here is a video of a cold start.
Not so healthy to rev it like this on a cold engine...
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      04-26-2009, 08:30 AM   #9
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Quote:
Originally Posted by hotrod182 View Post
Does anyone know the weight comparison between these and the factory set up?
Most aftermarket downpipe back exhausts (that remove the second set of cats) save between 20 and 30lbs over the factory setup.

AE saves 24lbs
Britalman is about 30lbs

Others are similar. One of the things I like most about the HKS system and the AE system is that they use flanges to put together the pieces instead of slip joints.
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      04-26-2009, 08:36 AM   #10
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congrats and good choice :P
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      04-27-2009, 12:59 AM   #11
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Here are the stats per grassroots motorsports magazine. Thanks to usc335 for posting it up.

Stock: 270 hp/276 lb-ft; 78 lb system weight; 95 dB peak sound
BMP Supersprint (Axle-back): 278 hp/282 lb-ft; 89 lb system weight; 96 dB peak sound
BMP Supersprint (full system): 280 hp/281 lb-ft; 57 lb system weight; 98 dB peak sound
UUC Corsa RSC335: 276 hp/283 lb-ft; 89 lb system weight; 97 dB peak sound
Borla: 280 hp/281 lb-ft; 51 lb system weight; 97 dB peak sound
Autobahn Exotics: 280 hp/282 lb-ft; 62 lb system weight; 97 dB peak sound
Bimmerworld HKS: 283 hp/284 lb-ft; 61 lb system weight; 98 dB peak sound
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      04-27-2009, 01:30 AM   #12
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congrats on the new exhaust. i hate that rattle on a cold drive too...
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      04-27-2009, 08:33 PM   #13
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Quote:
Originally Posted by ra2fanatic View Post
congrats on the new exhaust. i hate that rattle on a cold drive too...
I think the rattling is from the under brace near the rear of the car. A couple of spacers should fix it
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      05-24-2009, 03:41 PM   #14
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looks nice...
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      05-24-2009, 04:52 PM   #15
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To bad Grassroots didn't test the BMW performance exhaust.... would really want to know what it puts down on the dyno.
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      05-24-2009, 07:35 PM   #16
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Quote:
Originally Posted by riceygts View Post
Here are the stats per grassroots motorsports magazine. Thanks to usc335 for posting it up.

Stock: 270 hp/276 lb-ft; 78 lb system weight; 95 dB peak sound
BMP Supersprint (Axle-back): 278 hp/282 lb-ft; 89 lb system weight; 96 dB peak sound
BMP Supersprint (full system): 280 hp/281 lb-ft; 57 lb system weight; 98 dB peak sound
UUC Corsa RSC335: 276 hp/283 lb-ft; 89 lb system weight; 97 dB peak sound
Borla: 280 hp/281 lb-ft; 51 lb system weight; 97 dB peak sound
Autobahn Exotics: 280 hp/282 lb-ft; 62 lb system weight; 97 dB peak sound
Bimmerworld HKS: 283 hp/284 lb-ft; 61 lb system weight; 98 dB peak sound
that's pretty handy thanks. do you know if they kept changing exhausts on the same car or was it diff cars that already had the exhausts on?
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      05-24-2009, 07:47 PM   #17
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JDM FTW!
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      05-24-2009, 08:03 PM   #18
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is the hks dp back or cat back?
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      05-24-2009, 08:37 PM   #19
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It's a DP back
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      05-24-2009, 08:53 PM   #20
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Looks great! Glad to hear the fitment is right on.
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      05-24-2009, 10:23 PM   #21
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Quote:
Originally Posted by JoeyFiasco View Post
that's pretty handy thanks. do you know if they kept changing exhausts on the same car or was it diff cars that already had the exhausts on?
Same car that they kept changing the exhaust on.
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      05-25-2009, 04:28 AM   #22
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Just curious. What do people do with the OEM exhaust after installation of an aftermarket?
Do they sell it or keep it to reinstall for resale?
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