The picture in the link you posted does not have a test pipe , just a hfc .

The center magnaflow replaces the catalytic converter . I don't think there is enough room to fit both .

As for testing . You could run a non fouler as long as they just check the obd2 . However if they use a sniffer , then at the time when testing is needed you can get a hfc. I actually have the buschur hfc but the flange cut off if you want that . Because what I did was, I simply used it's flange to clamp on to the 6 " muffler and bolt it to my exhaust .

 

Ca. law calls for 20" away.

So I just did a compare of a Omega HHSL1 sound measuring device vs. my phone running the free android boy decibel meter app.

California law calls for measuring 20" away from the exhaust tip between 3k-5k. I just performed a 3k rev check.

--------------******** Outside ********
--------------------Omega HHSL1-----Phone
--------------------db-C / db-A---------db-A
1200rpm---------108 / 86 ----------- 93
3000rpm---------110 / 93 ---------- 96

#### not sure why my phones outside 3k value is different than the other day??

----******** Inside w-windows closed********
--------------------Omega HHSL1-----Phone
--------------------db-C / db-A---------db-A
1200rpm-------86-94 / 62 ----------- 60
3000rpm---------- 86 / 71 ---------- 72

inside cabin #'s are pretty close to each other when measuring in db-A

 

I'm exactly in your situation and I'm not 20 years old trying to show everyone I have a performance machine. Had 9 years with my talon with loud exhaust and promise myself NOT to do it with the evo.

A lot of persons here will say , hey try this one it's quiet, or this one it's almost as stock. So I bought the Greddy EVo2 with some feedback and it's VERY loud "compared" to stock. (for reference: MR 02, MR DP, MR resonated TP)

BlueEvo seems the best reference as trying numerous setup.

Didn't saw the Dynomax VT and it'S too bad as I ordered the 2 Magnaflows setup and it's 4th on the list of quietness.

I will give feedback as I install this next week.

 

I will be replacing my current round 7" x 18" muffler with the dynomax vt unit next week.

I already know / pretty confident that i will have to modify my flapper to reduce / hopefully eliminate the flapping = 2.3L with s2 cams.....should be fun!

when i placed a board against the tip of my muffler @ idle, there was a significant reduction in "boominess" with 1/2 the tip closed.

 

Well I finally got around to making a video and transferring the file to a computer. Heres a clip of an RM01a, Megan DP/TP/o2 Housing:

http://www.youtube.com/watch?v=TVZw1YO4lpw

 

I had a bad experience with a nonfouler. Wouldn't set the readiness code, thus, no pass in NC. Not sure if the Evo unit will allow it to set the readiness. I think the design that puts the o2 out of the exhaust flow may do it.

Yeah, I'll agree that the inside cabin numbers are close on dba. Try your android app every day at idle and see if it consistently returns 60db-A.

For kicks, I'll run it on my Nexus One and G1 and see what mine says, lmao.

Yeah I agree. Someone that has tried that many setups is certainly the closest we will come to an owner/expert.

I actually think you will be happy with the 2 Magnaflows. May I ask EXACTLY what you ordered? Did you order the buscur Magnaflow turbo-back and 6" Magnaflow from Summit (or elsewhere)? Otherwise, I don't think you get the pipe for the 6" with the cat-back.

 

Just to confirm my point, I took my car to a local racer-owned alignment shop that specializes in aggressive street and track setups to have my ride height raised slightly and the alignment tweaked for the street.

He tracks frequently and sees many track cars from spec miatas to full-cage race cars, and he said mine was seriously too loud. The first thing he noticed was the earplugs in the cupholder, and when I mentioned it, he said, you've got to QUIET THAT THING DOWN. With that emphasis.

Maybe it is the hearing loss I suffered on my recent trip with the Evo, but it didn't sound that loud today. It did drone like a mother though.

 

Sounds pretty effing loud to me. I can never judge by those videos though, they are too inconsistent. I don't suppose you have a smartphone with a db app?

Yeah, we used to do this all the time, hold our hands over the tailpipe exit on our bikes. They quiet to the point you can hear valvetrain noise chattering. If anyone reads this and tries it, be sure to remember, bare hand is ok when the exhaust is completely cold, but gloved hand otherwise.

Of course, we would cover the entire thing instead of half the tip. That's interesting. What steps do you think you'll start with on the flapper? Drilling it as BluEVOIX suggested? or dremel the edge or what?

 

Yeah, that is what I was asking. Is the "Test Pipe" actually the same physical location as the HFC section. I don't know if Mid-Pipe, or what, is the correct name, but you answered my question in that the HFC likely won't fit with the 6" muffler.

 

I dont have a smart phone/db app, but I think the camera was placed too close to the exhaust. I'll try and make another video later this week at a different distance.

 

The problem is not the camera, its that we have nothing to compare the exhaust to in the video to really understand how loud/quiet something is. Maybe compare it to a random car with oem exhaust ?

 

I plan to dremel the edge of the flapper... I plan to start on the top of it & horizontally work lower & lower till i dont get the banging....

if the thing is still banging, then off with it's head...or in this case the flapper & onto plan c =

 

OK, my wife took over my Nexus One, and my G1 crapped the bed, so I got a Nexus S yesterday and downloaded the android boy Decibel Meter app. I should note that when I downloaded it, it says the app was calibrated for Droids and Nexus S, so I'd think our results would be comparable.

Here are the results:
2005 Evo VIII
HKS 272/272, AMS GT35R
GTSpec Headers, Perrin 3" downpipe, CBE, HFC.

--------------******** Outside ********
--------------------Phone
--------------------db-A
1200rpm---------93 (distance 20')
3000rpm---------no data (no second person)


----******** Inside w-windows closed********
--------------------Phone
--------------------db-A
1200rpm---------73
3000rpm---------82

EDIT: HOLY ****! I just saw that your distance was 20" as in INCHES. I didn't read this post before I went out and measured... mine was 93 db at 20 FEET.

So from seeing these... It's pretty evident that my car is as loud as I think it is. I started it this morning and came back in to let it warm up, and when it idled down, the dishes were rattling in the cabinets.

 

Ok, so I'm considering this with my HFC instead of test pipe.

I know the noise is going to be where I want it to be (near stock) but I think I'm going to lose power big-time.

Anybody have any rough ideas how much you lose going to a stock CBE?

 

I have the Greddy Evo II with test pipe and 3"down pipe. Also had the neck down on it cut off. It's on the quiet side for me, I'd like to have something a bit louder but don't know which other one I'd want that isn't too loud.