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Old 06-15-2008, 08:31 PM   #1 (permalink)
 
Lgaruti's Avatar
 
Location: West Central Florida - Seminole
Drive: Brabus,Passion Ford GT,DB9
BPP Center Exit Exhaust too loud? Here’s a mod.

I like the look of the BPP center exhaust but found it a bit too loud for every day driving. I measured 94db four feet back from the exhaust and 90 db in the cabin at idle. 50 mph the cabin varied between 92 – 96 db noise level (road noise + exhaust). Just too much for me.
After the mod. the cabin measured 84 – 86 db and the exhaust four feet back at idle was 92 db. It still sounds great but not overly loud.

Gas mileage and performance is yet unknown as the inserts do add some backpressure. The smart seems to have a little more bottom end and less top end over 6000 rpm.

Here’s the mod:

Purchase (2) 4” long exhaust baffles for a 2” motorcycle exhaust pipe. They are available via the internet and cycle shops.
Purchase (2) 1 ¾ id to 2”od exhaust adaptors. I got mine at AutoZone. see pic.




If you can find a baffle for a 2 1/8” pipe the adaptor is not need.


Slide the baffle into the adaptor. The baffle has a ¼” mounting hole. Mark this hole on the adaptor and drill a ¼”. Place the baffle into the adaptor and line up the mounting holes.






Insert the adaptor & baffle assembly into the exhaust tip with the mounting hole down and place a mark on the underside of the tip corresponding to the mounting hole in the adaptor. I used a bent paperclip placing one end in the adaptor hole and the other marked the drill point.






Drill a ¼” hole in the bottom of the twin tip outlet. Center punch then start with the smallest bit possible and work up to ¼”. The tip is double walled so take your time.

Re install the assembly, insert the bolt that came with the baffle and secure with lock washer and nut.


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Old 06-16-2008, 06:55 AM   #2 (permalink)
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Location: Silicon Valley, Ca
Drive: 2008 smart Cabriolet
Did you have the sport or touring version?

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Old 06-16-2008, 01:02 PM   #3 (permalink)
 
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Location: West Central Florida - Seminole
Drive: Brabus,Passion Ford GT,DB9
Quote:
Originally Posted by geosynch View Post
Did you have the sport or touring version?
Sport version...

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Old 06-17-2008, 10:28 AM   #4 (permalink)
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Location: Florida
Drive: Corvette Z06, Smart + More
I like the mod very ingenious.

However you can always purchase the touring version instead of the sport.

Ernie
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Old 06-17-2008, 08:14 PM   #5 (permalink)
 
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Location: West Central Florida - Seminole
Drive: Brabus,Passion Ford GT,DB9
Quote:
Originally Posted by BreathlessPerformance View Post
I like the mod very ingenious.

However you can always purchase the touring version instead of the sport.

Ernie
Ernie, How much quieter is the touring version? Larry

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Old 07-04-2008, 10:15 AM   #6 (permalink)
 
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Location: Northern Macomb County, MI
Drive: Smart Passion Coupe
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I seem to recall reading somewhere that the touring version is in the 60's, but don't recall exactly. It was either that or about 60% louder than stock. IIRC

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Old 07-08-2008, 05:03 PM   #7 (permalink)
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Location: Florida
Drive: Corvette Z06, Smart + More
Now about 20% quieter

Ernie
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www.BreathlessPerformance.com
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Old 07-08-2008, 05:43 PM   #8 (permalink)
 
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Location: Rochester, NY
Drive: Red/black Passion
Since getting the sport version, I'll say this - the only time I thought it was a little too loud was when pulling into a church parking lot. Every other time, I think it sounds great, and everyone who hears it really likes it. No, it doesn't wake the neighbors!

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Old 08-10-2008, 11:56 AM   #9 (permalink)
 
Location: Los Angeles
Drive: Passion Coupe
BPP

Quote:
Originally Posted by BreathlessPerformance View Post
Now about 20% quieter

Ernie
Hey ernie, is there really a 20% decrease in sound? on your site it still says 12%

"Available in Sport Version or Touring ( a little quieter 12 percent)"

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Old 08-10-2008, 04:55 PM   #10 (permalink)
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Location: Silicon Valley, Ca
Drive: 2008 smart Cabriolet
I should be getting my touring version tomorrow. I'm a little nervous it'll be too loud, as there have been complaints about the touring version as well.

What I'd like to know is, how is the 12% (or 20%) quieter measured? Typically sound is measured in decibels, which are logarithmic. 80 db v. 90 db is 10 db quieter, which means it is 10 times quieter, not 11% (90-80)/90 taken as a percent. 3db quieter is a reduction of 50%.

A true 12% (or even 20%) reduction would be less than 1 db. One db is about the limit of most peoples ability to perceive a difference.

So, if the sport and touring versions have been measured by a db meter, I'd love to know the results.

geosynch

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