Quiet Exhaust??? - Mazda 6 Forums : Mazda 6 / Mazda Atenza Forum

mmarfan · 11-13-2009, 11:00 PM

Does anyone on here have a good custom setup with a 3" catback that is very quiet? I currently have the Corksport and it's just a bit too loud for me (probably because I'm running an open DP), but I really loved the power increase with the 3" pipe. What I want to do is just have a custom setup with the 3 inch split to 2 - 2 1/2 inch pipes in the back. I would like to see if anyone on here has something remotely close to this.

LBV · 11-14-2009, 08:49 AM

Right here. Using Magnaflow 14216's out back and no drone at all. In fact I often drive with the sunroof tilted up just to get more of the sound into the cabin.

airjeff · 11-14-2009, 09:09 AM

I have the CPE with the resonator option, I really like it, but I don't have my catted DP in yet. CPE should offer an option to put in their 2.5" mufflers on the system. Another option is to put in some restrictors in like this: http://www.summitracing.com/parts/CCI-3DI03R/ They have ones with more or less of those discs depending on what you need. Pretty much acomplishes the same thing as a smaller pipe. We'd install them in the pipe after the muffler. Let us know what you do and how it turns out, should turn out great for you!

mmarfan · 11-14-2009, 10:05 AM

QUOTE (LBV @ Nov 14 2009, 07:49 AM)

Quote:

Right here. Using Magnaflow 14216's out back and no drone at all. In fact I often drive with the sunroof tilted up just to get more of the sound into the cabin.[/b]

Any sound clips? I see you have the corksport DP, do you have the shory that keeps the cat? It'd be nice if it'd quiet it down with just 2 mufflers.

QUOTE (airjeff @ Nov 14 2009, 08:09 AM)

Quote:

I have the CPE with the resonator option, I really like it, but I don't have my catted DP in yet. CPE should offer an option to put in their 2.5" mufflers on the system. Another option is to put in some restrictors in like this: http://www.summitracing.com/parts/CCI-3DI03R/ They have ones with more or less of those discs depending on what you need. Pretty much acomplishes the same thing as a smaller pipe. We'd install them in the pipe after the muffler. Let us know what you do and how it turns out, should turn out great for you![/b]

Very interesting...

LBV · 11-14-2009, 01:13 PM

I just did a vid inside the car all glass closed but it really does not accurately reflect the way it sounds in real life ... sounds a bit droney in a spot or 2 on the vid when it doesn't to my ears in actuality. I can still e-mail you the vid (PM me) but I'd say it's maybe 10-15% louder than stock.

mmarfan · 11-14-2009, 01:35 PM

PM sent... thanks!

amunre · 11-15-2009, 02:24 PM

The ETS is 3" to 2.5" at the split to the mufflers/resonators. I've heard it back to back with the Corksport, which I found to have a somewhat similar sound, but in my opinion the ETS sounding a bit racier, and indeed a bit quieter. If I had to quantify it, I'd say the ETS is somewhere between the Magnaflow catback and CS catback in terms of volume. All seem to have noticeable bass on deceleration, again, just with differing degrees of intensity and volume... This car's cabin was just never designed/built to filter out some of those basier notes of an aftermarket exhaust...

priceprince · 11-15-2009, 04:49 PM

The GHL with the resonator isn't a quiet 3" exhaust, that's for sure. This is coming from a guy with both cats still on. I'm sure I'd get pulled over all the time if I put a downpipe on.
I'd say that a 2.5" Magnaflow system would still be loud with a downpipe installed..
But it's all personal preference, I just don't like to have a really loud daily driver.

j2south · 11-16-2009, 10:48 PM

jracer815 is about to go open DP with the magnaflow catback. I'd ask him as soon as he's done!

stout · 11-18-2009, 05:15 PM

It has been posted before that to get the most power gains from the exhaust that you must open it up as much as possible the near the turbo (3 inch diameter and a single high flow cat, I never would do catless) and then go smaller at the mufflers to reduce the sound.
Tapering down to a point that the stock mufflers will work is an option.

I'm no engineer but this has been explained as getting the hot,high energy, high velocity exhaust gases away from the turbo as efficiently as possible and once you get to the mufflers that exhaust heat/energy/velocity has decreased so dramatically that the stock mufflers(or similar diameter mufflers) will provide enough flow.

Power, without the noise, with a bit more attitude (sound).

I had a corksport catback and hated it, even after I had a GHL resonated welded into it.
My 911 with a sport exhaust is all the growl I need. The speed6 has the OEM exhaust on it now.

11-13-2009, 11:00 PM	#1 (permalink)
mmarfan Mazda Guru Join Date: May 2003 Location: Middletown, Oh Posts: 2,110 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Does anyone on here have a good custom setup with a 3" catback that is very quiet? I currently have the Corksport and it's just a bit too loud for me (probably because I'm running an open DP), but I really loved the power increase with the 3" pipe. What I want to do is just have a custom setup with the 3 inch split to 2 - 2 1/2 inch pipes in the back. I would like to see if anyone on here has something remotely close to this. __________________ The new: 2006 Mazdaspeed6 Sport Velocity Red 1/4 - 13.739 @ 98.10 (Stock) w/ 1.787 60' Mods: 18" Tenzo Type M w/ 225/40/18 Kumho Ecsta SPT, Tein S springs, Mazdaspeed CAI, CP-E Standback, ETS TMIC, CP-E "Catless" DP w/ 53009 Magnaflow cat welded in, Corksport Exhaust, STRI DSD-SLM II 60mm Boost Gauge, Dashhawk, Synapse BOV; 0 - 60 4.64 (dashhawk) The old: 2003 6S MTX Speed Yellow /18" RSL ADR Mase/ 18" Nakayama Higari/ HIDs (6000K)/ Painted 'stash/ INJEN-CPE /BR Lip /Sprint Springs 1/4 14.503 @ 96.56 Post your time slips! Drag racing tips!

11-14-2009, 08:49 AM	#2 (permalink)
LBV Rally Racer Join Date: Mar 2007 Location: Brampton, ON, Canada Posts: 1,010 Thanks: 0 Thanked 1 Time in 1 Post Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Right here. Using Magnaflow 14216's out back and no drone at all. In fact I often drive with the sunroof tilted up just to get more of the sound into the cabin. __________________ 2007 White MazdaSpeed 6

11-14-2009, 09:09 AM	#3 (permalink)
airjeff Track Racer Join Date: Sep 2006 Location: MN Posts: 378 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	I have the CPE with the resonator option, I really like it, but I don't have my catted DP in yet. CPE should offer an option to put in their 2.5" mufflers on the system. Another option is to put in some restrictors in like this: http://www.summitracing.com/parts/CCI-3DI03R/ They have ones with more or less of those discs depending on what you need. Pretty much acomplishes the same thing as a smaller pipe. We'd install them in the pipe after the muffler. Let us know what you do and how it turns out, should turn out great for you! __________________ 2006 MS6 - Velocity Red </span>[/u][/b]Engine Mods: CPE Nano, CPE Nvsicid, CPE dual exhaust w/resonator, CPE PNP Standback, CPE FCF. CPE FMIC, Synchronic BOV Driveline Mods: CPE diff mount, TT diff mount, CPE mm Suspension Mods: RPM Sport springs, SPC adjustable ball joints, Forged Rays MS rims Other Mods: VG Sharkfin, Clear side markers, 808's adjustable sub EQ, Dashhawk Waiting install: CPE catted DP, DNP manifold, Whiteline Swaybar

11-14-2009, 01:13 PM	#5 (permalink)
LBV Rally Racer Join Date: Mar 2007 Location: Brampton, ON, Canada Posts: 1,010 Thanks: 0 Thanked 1 Time in 1 Post Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	I just did a vid inside the car all glass closed but it really does not accurately reflect the way it sounds in real life ... sounds a bit droney in a spot or 2 on the vid when it doesn't to my ears in actuality. I can still e-mail you the vid (PM me) but I'd say it's maybe 10-15% louder than stock. __________________ 2007 White MazdaSpeed 6

11-14-2009, 01:35 PM	#6 (permalink)
mmarfan Mazda Guru Join Date: May 2003 Location: Middletown, Oh Posts: 2,110 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	PM sent... thanks! __________________ The new: 2006 Mazdaspeed6 Sport Velocity Red 1/4 - 13.739 @ 98.10 (Stock) w/ 1.787 60' Mods: 18" Tenzo Type M w/ 225/40/18 Kumho Ecsta SPT, Tein S springs, Mazdaspeed CAI, CP-E Standback, ETS TMIC, CP-E "Catless" DP w/ 53009 Magnaflow cat welded in, Corksport Exhaust, STRI DSD-SLM II 60mm Boost Gauge, Dashhawk, Synapse BOV; 0 - 60 4.64 (dashhawk) The old: 2003 6S MTX Speed Yellow /18" RSL ADR Mase/ 18" Nakayama Higari/ HIDs (6000K)/ Painted 'stash/ INJEN-CPE /BR Lip /Sprint Springs 1/4 14.503 @ 96.56 Post your time slips! Drag racing tips!

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11-15-2009, 02:24 PM	#7 (permalink)
amunre Rally Racer Join Date: Nov 2005 Location: LV, NV Posts: 1,015 Thanks: 0 Thanked 2 Times in 1 Post Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	The ETS is 3" to 2.5" at the split to the mufflers/resonators. I've heard it back to back with the Corksport, which I found to have a somewhat similar sound, but in my opinion the ETS sounding a bit racier, and indeed a bit quieter. If I had to quantify it, I'd say the ETS is somewhere between the Magnaflow catback and CS catback in terms of volume. All seem to have noticeable bass on deceleration, again, just with differing degrees of intensity and volume... This car's cabin was just never designed/built to filter out some of those basier notes of an aftermarket exhaust...

11-15-2009, 04:49 PM	#8 (permalink)
priceprince Track Racer Join Date: Jul 2006 Location: Northern California Posts: 906 Thanks: 7 Thanked 0 Times in 0 Posts Groans: 2 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	The GHL with the resonator isn't a quiet 3" exhaust, that's for sure. This is coming from a guy with both cats still on. I'm sure I'd get pulled over all the time if I put a downpipe on. I'd say that a 2.5" Magnaflow system would still be loud with a downpipe installed.. But it's all personal preference, I just don't like to have a really loud daily driver. __________________ 2006 Mazdaspeed 6, Liquid Platinum Metallic, COBB SFI and AP Stage 1+, GHL Dual Catback Exhaust, RPM Street Springs, Streetunit rear Motor Mount, Audiolink MP3 input, sharkfin antenna, 18" Enkei EVO 5 wheels with Goodyear F1 Allseason tires 225-40-R18. On factory turbo #2...

11-16-2009, 10:48 PM	#9 (permalink)
j2south Track Racer Join Date: Jun 2008 Location: Salt Lake City Posts: 805 Thanks: 0 Thanked 3 Times in 3 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	jracer815 is about to go open DP with the magnaflow catback. I'd ask him as soon as he's done! __________________ 2006 MAZDASPEED 6 is no more... :..( PARTING OUT!!! FOR SALE!!! SM Stage II OCC ($150) DashHawk ($225)

11-18-2009, 05:15 PM	#10 (permalink)
stout Track Racer Join Date: Aug 2006 Location: The first State Posts: 606 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	It has been posted before that to get the most power gains from the exhaust that you must open it up as much as possible the near the turbo (3 inch diameter and a single high flow cat, I never would do catless) and then go smaller at the mufflers to reduce the sound. Tapering down to a point that the stock mufflers will work is an option. I'm no engineer but this has been explained as getting the hot,high energy, high velocity exhaust gases away from the turbo as efficiently as possible and once you get to the mufflers that exhaust heat/energy/velocity has decreased so dramatically that the stock mufflers(or similar diameter mufflers) will provide enough flow. Power, without the noise, with a bit more attitude (sound). I had a corksport catback and hated it, even after I had a GHL resonated welded into it. My 911 with a sport exhaust is all the growl I need. The speed6 has the OEM exhaust on it now. __________________ 2006 Speed6 GT - Titanium/black leather RPM Sports/Bilstein HDs:Optima red top:EBC Redstuffs/rotora rotors 18 x 7.5 BBS RGRs Diamond Black with 225/45/18 Continental Contisport 3s (for summer) Stock rims with 215/45/18 falken ZIEX-912 (for winter) My other car: 2003 911 Arctic Silver/Metropol Blue interior - Loaded Want a mod that makes your car faster? Fix the nut behind the wheel.