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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 > Catless DP & Interior dB



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      05-13-2013, 05:03 PM   #1
dreidurtyfive
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Catless DP & Interior dB

So here is my question of the day... What is the average interior decibels you guys are getting at highway cruising speeds (60-70mph, AC Off, radio off no conversation) that are running any brand of catless DP, I am looking for some data with catelss DP and stock exhaust preferably. I will take data from aftermarket exhaust as well. Also if anyone wants to help capture this data if you have an iPhone can get a free decibel meter app and I would assume the same on android platform as well.

Thanks!
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      05-13-2013, 05:18 PM   #2
Jeef
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Cat less dp with stock exhaust here... I don't notice any sound when cruising 80 just road noise haha. Is the db app accurate?
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      05-13-2013, 05:31 PM   #3
Beemw335
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cruising will be very similar to stock, just deeper not much louder, its under heavy throttle that downpipes make more of a difference.
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      05-13-2013, 07:50 PM   #4
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What about cat less DP's + Muffler delete? Is that too loud for daily driving use? I'm currently with only a Muffler Delete (stock everything else).
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      05-13-2013, 07:55 PM   #5
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Quote:
Originally Posted by DanielGonz View Post
What about cat less DP's + Muffler delete? Is that too loud for daily driving use? I'm currently with only a Muffler Delete (stock everything else).
Its going to drone like crazy, but thats largely due to the existing muffler delete. DPs didnt add much volume for me, just made the tone more aggressive and a little more raspy.
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      05-13-2013, 07:56 PM   #6
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I have AR catless dps and the hpf gen 2 exhaust and I thought I was going to lose my mind for the first few days. The drone was beyond ridiculous. Between 2500 and 3k rpm at 80 mph fuhhhgettaboutit. It's been 2 weeks now and I'm getting use to it. I even contemplated getting rid of the exhaust but it sounds soooooooo freaking sexy from the outside lol. Best sounding exhaust that I've ever heard from the outside of the car. Upon acceleration or wot its pure sex. Only negative is that drone on the inside between 2500 and 3000. Hope this helps! Lol
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      05-13-2013, 09:12 PM   #7
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Quote:
Originally Posted by 335coupe2007
I have AR catless dps and the hpf gen 2 exhaust and I thought I was going to lose my mind for the first few days. The drone was beyond ridiculous. Between 2500 and 3k rpm at 80 mph fuhhhgettaboutit. It's been 2 weeks now and I'm getting use to it. I even contemplated getting rid of the exhaust but it sounds soooooooo freaking sexy from the outside lol. Best sounding exhaust that I've ever heard from the outside of the car. Upon acceleration or wot its pure sex. Only negative is that drone on the inside between 2500 and 3000. Hope this helps! Lol
+1 love this setup

Just catless downpipes won't change cruising volume by any noticeable amount at all but it will add a little rasp when WOT
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      05-14-2013, 12:53 PM   #8
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Quote:
Originally Posted by 135Pats View Post
Its going to drone like crazy, but thats largely due to the existing muffler delete. DPs didnt add much volume for me, just made the tone more aggressive and a little more raspy.
Damn. lol
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      05-14-2013, 05:59 PM   #9
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Honesty I don't notice a difference inside the car with all windows shut. MAYBE at WOT but still not significant.
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