Anyone with modified exhaust systems experience decreased mpg? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 12 (permalink) Old 03-09-2019, 08:58 PM Thread Starter
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Anyone with modified exhaust systems experience decreased mpg?

I’m looking into getting an exhaust system, but I’m prioritizing the fuel efficiency over the negligible hp gain. So with that being said anyone have any data or input on how a modified exhaust has affected their mpg?

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2015 Mazda 6 Sport
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post #2 of 12 (permalink) Old 03-11-2019, 07:22 AM
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Depends on how much of the Exhaust you're replacing, If you you're just installing a Cat-back/Axle-Back Exhaust you really shouldn't see a major Dip in MPG loss. If you do then it's most likely due to a heavy right foot. I haven't seen any MPG loss on mine & I'm running a Corksport intake & Racing Beat Axle-Back exhaust. These car sip on Gas so if so you're that concerned about losing MPG leave it stock. Gotta Pay to Play

2015 Mazda 6 Touring 6 Spd Manual Deep Crystal Blue Metallic- Cork Sport SRI w/Cold Air Box, Racing Beat Exhaust, JBR Short Shift Plate, Full Kicker Audio.

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post #3 of 12 (permalink) Old 03-19-2019, 06:52 PM
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I have had the RB axleback for over 3 years now, car can still achieve over 35 mpg no issues on highway driving.

2014 Mazda 6 Touring Liquid Silver
[ OVT 91 octane tune ][ CS Power Series SRI+Airbox ][ Racing Beat Axleback ][Paddle Shift retrofit][ Morimoto XB35 35w 5000k HID lows ][ LED interior lights and plate lights ][ 3M FX HP Tint ][ Dipped rims and dipped trim ]

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post #4 of 12 (permalink) Old 04-19-2019, 01:09 PM
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I didn't get a change on MPG and im running AEM intake with Tanabe Axleback Exhaust.

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post #5 of 12 (permalink) Old 04-19-2019, 01:19 PM Thread Starter
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Originally Posted by mazdanga View Post
I didn't get a change on MPG and im running AEM intake with Tanabe Axleback Exhaust.
Has the AEM intake helped performance at all?

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2015 Mazda 6 Sport
-Soul Red
-2.5L
-Automatic

Mod List *Always in progress*
1. Debadge (lol) 03/09/2019
2. Interior LED's 03/16/2019
3. Front Strut Tower Bar 03/23/2019
4. Front License Plate Delete (lol) 03/24/2019
5. CorkSport Axelback Exhaust 03/29/2019
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post #6 of 12 (permalink) Old 04-22-2019, 10:07 AM
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Yes. I have noticed a better throttle response and MPG has also improved when i don't have a heavy foot.

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post #7 of 12 (permalink) Old 04-22-2019, 03:56 PM Thread Starter
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Originally Posted by mazdanga View Post
Yes. I have noticed a better throttle response and MPG has also improved when i don't have a heavy foot.
I’ve heard aftermarket intakes cause a loss of power in the low-mid range, have you noticed/experienced that with your car?

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2015 Mazda 6 Sport
-Soul Red
-2.5L
-Automatic

Mod List *Always in progress*
1. Debadge (lol) 03/09/2019
2. Interior LED's 03/16/2019
3. Front Strut Tower Bar 03/23/2019
4. Front License Plate Delete (lol) 03/24/2019
5. CorkSport Axelback Exhaust 03/29/2019
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post #8 of 12 (permalink) Old 04-25-2019, 02:22 PM
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Quote:
Originally Posted by Modzas6x View Post
Iíve heard aftermarket intakes cause a loss of power in the low-mid range, have you noticed/experienced that with your car?
I just put an AEM intake onto my car last night, and on the half hour drive into work this morning, I didn't notice any change in power. With that said, it was morning and I still wasn't entirely awake. The one thing that I did notice was a wonderful new growl as I was accelerating. Made me want to drive faster and faster just to hear the noise...
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post #9 of 12 (permalink) Old 04-25-2019, 02:28 PM Thread Starter
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Quote:
Originally Posted by huntermm View Post
Quote:
Originally Posted by Modzas6x View Post
I’ve heard aftermarket intakes cause a loss of power in the low-mid range, have you noticed/experienced that with your car?
I just put an AEM intake onto my car last night, and on the half hour drive into work this morning, I didn't notice any change in power. With that said, it was morning and I still wasn't entirely awake. The one thing that I did notice was a wonderful new growl as I was accelerating. Made me want to drive faster and faster just to hear the noise...
Interesting, if you notice any significant change in performance or mpg let us know!

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2015 Mazda 6 Sport
-Soul Red
-2.5L
-Automatic

Mod List *Always in progress*
1. Debadge (lol) 03/09/2019
2. Interior LED's 03/16/2019
3. Front Strut Tower Bar 03/23/2019
4. Front License Plate Delete (lol) 03/24/2019
5. CorkSport Axelback Exhaust 03/29/2019
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post #10 of 12 (permalink) Old 04-25-2019, 06:52 PM
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It seems to me that at the lowest rpm ranges (if memory serves... i.e. just above 2500 rpm) the CorkSport Axleback system makes slightly less torque than does the stock system. If this is the case and if you drive an axleback equipped car in a manner that is the same... (meaning calling for the same acceleration) as the stock exhaust equipped car - then it will use a bit more fuel - depending on whether you typically linger in those low rpm regimes... versus at higher rpm's (where it makes marginally more torque than the stock exh. sysyem car) and will get a 'wee bit better gas mileage.

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Last edited by Cdn17Sport6MT; 04-25-2019 at 07:06 PM.
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