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post #1 of 13 (permalink) Old 07-10-2008, 06:38 PM Thread Starter
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open downpipe?

I am not to familiar with open downpipe honestly.What are the positive and negative things about open downpipe?Also does that just mean that the catback exhaust is off except the downpipe or the downpipe and exhaust system is off and just left with the headers on?

2006 Chevy Cobalt LT
Synthetic oil
K&N air intake system
Custom 2.5" dynomax exhaust system
B&M shiftplus
B&M tranny cooler
Catless Downpipe
stainless steel pacesetter header
5900k light bulbs
2.4 intake manifold
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post #2 of 13 (permalink) Old 07-10-2008, 09:04 PM
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Its gonna be loud as S***!

You'll more than likely gonna lose power with the backpressure gone but only see a slight improvemet in the top end 5000rpm and up.

go for it and have fun with it, and if you don't like just bolt the exhast system right back up.


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post #3 of 13 (permalink) Old 07-10-2008, 09:16 PM Thread Starter
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well no wonder why I beat my buddies cobalt that has a open downpipe then yesterday lol.I was just curious on what it does,but if people lose power because of it no reason to do that then.

2006 Chevy Cobalt LT
Synthetic oil
K&N air intake system
Custom 2.5" dynomax exhaust system
B&M shiftplus
B&M tranny cooler
Catless Downpipe
stainless steel pacesetter header
5900k light bulbs
2.4 intake manifold
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post #4 of 13 (permalink) Old 07-11-2008, 03:13 AM
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Well as we have all seen with fart cans, people do stupid stuff just to be loud. Any of our Cobalts are not pushing enough exhaust gasses to get any advantage from an open downpipe, and it would most likely hurt performance. In response to the original question, open DP setups go from header to dp to cat and then nothing. There are positives to this, but mostly for bigger engine cars, and even then they mostly use cutouts.

My turbo lag is your courtesy head start.
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post #5 of 13 (permalink) Old 07-11-2008, 08:56 AM
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Yes... ^^ he is right... you need a lot more power to benefit from a open down pipe and none of our cars are even close to producing that much yet. Plus it is obnoxiously loud. Some cars have a handle that lets you just open a valve so it lets you run opend downpipe or flip it the other way and you run your regular exhaust



Mod's So Far: AEM CAI, C.A. Header, 2.50 Magnaflow Catback Exhaust , ZZP Catless Downpipe, DC Carbon Strut Bar, Dropped on Progress Springs. Tinted, Fully Debadged, Custom front SS bumper,2 Audiobahn 10" w/JL amp, Lower Billett Grille, Sengen 18 x 8 rims wrapped in Capitol Sport UHP 225/40/18.

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post #6 of 13 (permalink) Old 07-11-2008, 09:07 AM
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An open downpipe on a 4 banger is just absurdly loud and makes you look like a ricer. Plus you'll get to know all the local cops quickly.

Repopulating yourcobalt.com one post at a time.

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post #7 of 13 (permalink) Old 07-11-2008, 10:36 AM
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Quote:
Originally Posted by Chester View Post
Yes... ^^ he is right... you need a lot more power to benefit from a open down pipe and none of our cars are even close to producing that much yet. Plus it is obnoxiously loud. Some cars have a handle that lets you just open a valve so it lets you run opend downpipe or flip it the other way and you run your regular exhaust
A cutout

My turbo lag is your courtesy head start.
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post #8 of 13 (permalink) Old 07-11-2008, 11:23 AM
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Yea.. i believe it is shaped like a y piece



Mod's So Far: AEM CAI, C.A. Header, 2.50 Magnaflow Catback Exhaust , ZZP Catless Downpipe, DC Carbon Strut Bar, Dropped on Progress Springs. Tinted, Fully Debadged, Custom front SS bumper,2 Audiobahn 10" w/JL amp, Lower Billett Grille, Sengen 18 x 8 rims wrapped in Capitol Sport UHP 225/40/18.

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post #9 of 13 (permalink) Old 07-11-2008, 11:42 AM Thread Starter
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ah ok,I have read somewhere a lot of muscle cars do that,but its understandable since those are bigger motors,yeah my one friend doesn't have a exhaust on his cobalt actually.I don't know when he will put his exhaust back on.

2006 Chevy Cobalt LT
Synthetic oil
K&N air intake system
Custom 2.5" dynomax exhaust system
B&M shiftplus
B&M tranny cooler
Catless Downpipe
stainless steel pacesetter header
5900k light bulbs
2.4 intake manifold
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post #10 of 13 (permalink) Old 07-11-2008, 03:04 PM
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ah ok,I have read somewhere a lot of muscle cars do that,but its understandable since those are bigger motors,yeah my one friend doesn't have a exhaust on his cobalt actually.I don't know when he will put his exhaust back on.
When he realizes he's a moron.

My turbo lag is your courtesy head start.
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