Dynomax Cat back
Supreme Member
Joined: Mar 2000
Posts: 1,777
Likes: 0
From: First one out of liberty city, burn it to the ground
yea more/less u will feel more of a difference off the line and the sound factor.....ur MPG will drop since it decreases back pressure!
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88 Firebird 2.8
MODS (either coming or on):
Flowmaster 80 series, Random Technologies Cat, 3" intermediate pipe, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6A
Currently Working On:
t5 swap
Next to buy:
Slp dual cold air intake!
------------------
88 Firebird 2.8
MODS (either coming or on):
Flowmaster 80 series, Random Technologies Cat, 3" intermediate pipe, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6A
Currently Working On:
t5 swap
Next to buy:
Slp dual cold air intake!
Junior Member
Joined: Sep 1999
Posts: 44
Likes: 1
From: Columbus, OH, US
Car: 89 Camaro RS
Engine: V-6
Transmission: Auto
The Dynamax cat-back was one of the best things I've done to my car. Off the line is much better and the sound is awesome.
The gas mileage went UP because I had an exhaust leak before the O2 sensor (replaced the donut gaskets in the exhaust manifold). I had other work done on the car, but I paid around $250 for the exhaust. Hope you enjoy yours.
The gas mileage went UP because I had an exhaust leak before the O2 sensor (replaced the donut gaskets in the exhaust manifold). I had other work done on the car, but I paid around $250 for the exhaust. Hope you enjoy yours.2011 Norwood Gathering
ThirdGen Firebird Rep
ThirdGen Firebird Rep
Joined: Jun 2000
Posts: 3,435
Likes: 4
From: Sarasota FL
Car: 99 WS6 / 00 SS / 11 CTS-V / 13 300
Engine: LS1 / LS1 / LSA / 5.7 Hemi
Transmission: 4L60E / T-56 / 6L80E / W5A80
Axle/Gears: 3.23 / 3.42 Auburn / 3.23 / 2.62
I have been told that MPG goes UP with a lower restriction exhaust. Supposedly less backpressure aids MPG...anyone else know about this?
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Jason E
'89 Camaro RS 2.8
Hypertech chip/K&N filters/Accel 8.8 wires/RapidFires
Eclipse CD and 100x4 amp/Boston plates and 6x9s
Alpine Alarm w/ Keyless entry
IROC tailights/tinted windows
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Jason E
'89 Camaro RS 2.8
Hypertech chip/K&N filters/Accel 8.8 wires/RapidFires
Eclipse CD and 100x4 amp/Boston plates and 6x9s
Alpine Alarm w/ Keyless entry
IROC tailights/tinted windows
Supreme Member
Joined: Mar 2000
Posts: 13,414
Likes: 6
From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
I agree with the rest, MPG should go up, because engine efficiency is increased.
I also noticed a big improvmement with my Dynomax Super Turbo catback, part #17493, $160 from Summit.
You can get one put on by doing it yourself, for free. That's how I did both of mine.
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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!
I also noticed a big improvmement with my Dynomax Super Turbo catback, part #17493, $160 from Summit.
You can get one put on by doing it yourself, for free. That's how I did both of mine.
------------------
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!
Trending Topics
Supreme Member
Joined: Mar 2000
Posts: 1,777
Likes: 0
From: First one out of liberty city, burn it to the ground
hmm...i dunnnooo...ive had MANY mechanics tell me that..and i even contacted pontiac on it through their 1800 number...
------------------
88 Firebird 2.8
MODS (either coming or on):
Flowmaster 80 series, Random Technologies Cat, 3" intermediate pipe, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6A
Currently Working On:
t5 swap
Next to buy:
Slp dual cold air intake!
------------------
88 Firebird 2.8
MODS (either coming or on):
Flowmaster 80 series, Random Technologies Cat, 3" intermediate pipe, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6A
Currently Working On:
t5 swap
Next to buy:
Slp dual cold air intake!
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