BHR new header and midpipe
El Jefe
Joined: Mar 2007
Posts: 1,833
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slightly less restrictive, different, and from reading a lot of posts it seems like anyone who started development of a single exit was asked to make a passenger side exit over the driver side exit. I understand that no matter what, someone will complain or want something else. My main reason for suggesting was purely to have another exhaust option on the table. I know that you make quality parts so I made a suggestion. I'm in the air over what exhaust to get and have considered going custom. since you said you are close to rolling out your header/midpipe combo I have decided to wait and weigh out all options thoroughly before committing to an exhaust upgrade. For now I'll just be content with my AP midpipe and wait the arrival of the BHR header.
How much bigger tubing we talkin' here, would 4" be the ticket? Or would it have to be exponentially larger, like 5 or 6 inch 
I don't think I could fit a 4" down pipe even.
I don't think I could fit a 4" down pipe even.
El Jefe
Joined: Mar 2007
Posts: 1,833
Likes: 7
El Jefe
Joined: Mar 2007
Posts: 1,833
Likes: 7
Registered
Joined: Aug 2004
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Originally Posted by yomomspimp06
slightly less restrictive, different, and from reading a lot of posts it seems like anyone who started development of a single exit was asked to make a passenger side exit over the driver side exit
However, since the pipe restriction is at least proportional to 1/diameter^4, one only needs to increase the diameter of a pipe by 19% or less in order to have the same restriction as 2 pipes. Pressure Drop: Calculation of pressure drops in pipes
So, having one 19% larger pipe as opposed to 2, leads in principal to about a 40% weight savings without an increase in flow restriction.
El Jefe
Joined: Mar 2007
Posts: 1,833
Likes: 7
The same flow through 2 equal pipes has half the restriction compared to one single pipe.
However, since the pipe restriction is at least proportional to 1/diameter^4, one only needs to increase the diameter of a pipe by 19% or less in order to have the same restriction as 2 pipes. Pressure Drop: Calculation of pressure drops in pipes
So, having one 19% larger pipe as opposed to 2, leads in principal to about a 40% weight savings without an increase in flow restriction.
However, since the pipe restriction is at least proportional to 1/diameter^4, one only needs to increase the diameter of a pipe by 19% or less in order to have the same restriction as 2 pipes. Pressure Drop: Calculation of pressure drops in pipes
So, having one 19% larger pipe as opposed to 2, leads in principal to about a 40% weight savings without an increase in flow restriction.
so increasing the oem 2.5 pipe to a 3 inch pipe should be sufficient for most.
There are a lot of individuality in exhaust systems--some people like a different exhaust note, some have turbos which influences that tone, some dont mid drone at cruising, some want it very quiet, some want it lightweight. There are different ways to route, there are different tube wall thickness'es to consider, different positions to place resonators etc, types of hangers to use, shielding requirements etc etc etc. All of them have an affect on how the exhaust note sounds and how it performs. It is NOT just piecing together a few pipes.
Big block days!! I had a 55 Chev with the aluminum headed 396 and many mods--beat ya Charles--I NEVER lost a race! HA! I couldnt stop the thing with the 55 drum brakes on it though
and my cam had too high of lift to run the vacuum powered windshield wipers--those were the days man......
There are a lot of individuality in exhaust systems--some people like a different exhaust note, some have turbos which influences that tone, some dont mid drone at cruising, some want it very quiet, some want it lightweight. There are different ways to route, there are different tube wall thickness'es to consider, different positions to place resonators etc, types of hangers to use, shielding requirements etc etc etc. All of them have an affect on how the exhaust note sounds and how it performs. It is NOT just piecing together a few pipes.
Big block days!! I had a 55 Chev with the aluminum headed 396 and many mods--beat ya Charles--I NEVER lost a race! HA! I couldnt stop the thing with the 55 drum brakes on it though
and my cam had too high of lift to run the vacuum powered windshield wipers--those were the days man......
course it was the overlap--thats why my jardine headers worked so well. i do have a tendency to generalize though--thanks for catching it.
Oh man to line up side by side with those cars would be a blast. Talk about body to chassis lift.---thats where it appears that the chassis is trying to outrun the body to those that are not familar.
I still love those Novas--when built--you cant do any better in a dual purpose car. The hemi cuda comes close--but does loose by a little.
Oh man to line up side by side with those cars would be a blast. Talk about body to chassis lift.---thats where it appears that the chassis is trying to outrun the body to those that are not familar.
I still love those Novas--when built--you cant do any better in a dual purpose car. The hemi cuda comes close--but does loose by a little.
i would wait for more official information from BHR / CRH ... anything else is speculation so take it with a grain of salt, but you can assume that no, a long tube header will not work with an existing midpipe
El Jefe
Joined: Mar 2007
Posts: 1,833
Likes: 7
there were updates on the BHR facebook page. Looks like it should be finished in Feb. Don't expect official production for a couple months though. I'm thinking a March/April release date. Completely speculation on my part though