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05-19-2014, 05:31 PM | #1 |
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Can anyone with a Muffler Delete get me dB readings?
As the title says.
I'm looking to get a Berk Race and I need to know what the dB readings are...specifically at full throttle and readings taken 50' away. SCCA has some strict dB readings and I want to make sure I am within the limits. |
05-19-2014, 05:38 PM | #2 |
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I would not try it. Even if someone else on the internet thinks its X db, your local chapter might read it as Y and DQ you, then you are stuck trying to sell it.
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05-19-2014, 05:40 PM | #3 | |
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Thinking of just fabbing up my own turn-down pipe right after the resonator to have it dump down there. Sure, doesn't have cool looking tips but is pretty functional. |
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05-20-2014, 08:51 AM | #4 |
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I'm running a straight pipe with no muffler...I can assure you it won't break SCCA's noise level...exhaust is still going thru pre-cats, cats, and resonators...it's somewhat louder than stock, but very pleasing...there's nice gurgling when you lift off the throttle, very racy sounding, and much easier to drive with the 6 speed because you can hear the engine...no droning at highway speeds, barely noticeable with the A/C on...
Just a note; I had John at Eurowerks in Deerfield, FL install AA's tune (he's an AA dealer)....when he called me to pick the car up, he commented on the exhaust; he said he couldn't believe how sweet it sounded with just removing the muffler and running a straight pipe out the back with dual tips...he didn't want his clients to know this, he told me, because he sells them expensive exhaust systems...LOL
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05-20-2014, 09:26 AM | #5 | |
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It is hard to tell from youtube videos since they vary on type of mic used...etc etc. Since it isn't really a high pitched sound, I would assume it wouldn't break dB readings. I have a friend that is running headers, 100 cell cats and 2 burns mufflers and not breaking sound. Since I'm still stock headers, and stock 1st and 2nd section I would think I would be okay. Did you just custom fab your own muffler? |
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05-20-2014, 01:25 PM | #6 |
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The muffler (at the back of the car) is completely gone, replaced with a straight pipe welded in with dual tips (see photo)....All other exhaust components are stock and in place....the muffler is a heavy, worthless, boat anchor...there's a vacuum line going to the muffler to open one of the dual tips (that tells how worthless it is, under full throttle, the muffler is by-passed), make sure you plug that vacuum line.....
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'13 128i 6sp, '19 Cherokee Ltd 3.2, '17 Ducati SuperSport S Gone But Not Forgotten: 74 Z28, 77 Datsun 280Z (1st 5sp in US), 92 Nissan 300ZTT, 94 MB SL600 V12, 01 M Roadster, 66 Yamaha TwinJet 100, 70 Suzuki X6 Hustler Race: GP/FP Spitfire SCCA, Merlyn FF SCCA, Mazda RX7 IMSA GTU, Yamaha FZR 400 AMA.
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05-20-2014, 01:37 PM | #7 | |
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05-20-2014, 05:57 PM | #8 | |
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Just would make my life easier to print a picture to hand to a shop and say..."Do that" Did the shop custom fab a hanger to the custom pipe to attach to the OEM hanger? Also, to confirm, OE diameter is 2.5"? I already had the golf tee mod done...did that day 1 I got the car |
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05-20-2014, 08:23 PM | #9 |
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I'll take a shot tomorrow morning....dark now
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'13 128i 6sp, '19 Cherokee Ltd 3.2, '17 Ducati SuperSport S Gone But Not Forgotten: 74 Z28, 77 Datsun 280Z (1st 5sp in US), 92 Nissan 300ZTT, 94 MB SL600 V12, 01 M Roadster, 66 Yamaha TwinJet 100, 70 Suzuki X6 Hustler Race: GP/FP Spitfire SCCA, Merlyn FF SCCA, Mazda RX7 IMSA GTU, Yamaha FZR 400 AMA.
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05-21-2014, 08:48 AM | #10 |
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'13 128i 6sp, '19 Cherokee Ltd 3.2, '17 Ducati SuperSport S Gone But Not Forgotten: 74 Z28, 77 Datsun 280Z (1st 5sp in US), 92 Nissan 300ZTT, 94 MB SL600 V12, 01 M Roadster, 66 Yamaha TwinJet 100, 70 Suzuki X6 Hustler Race: GP/FP Spitfire SCCA, Merlyn FF SCCA, Mazda RX7 IMSA GTU, Yamaha FZR 400 AMA.
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