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  #21  
Old 09-04-2006, 11:08 PM
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read ljnlaw's post.

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Originally Posted by DINANM3
Did you mean that with just header and no exhaust bolted on or with full exhaust. Because without the exhaust it would definately be no back pressure. But with full exhaust it should be fine
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  #22  
Old 09-05-2006, 01:42 AM
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So I guess headers and exhaust and first on my list of mods when I get my E60. Im sure you will need a software upgrade for that kind of mod. does anyone make it yet for a car with exhaust mods. By the way are there any intake mods out yet. And whats up with that extra filter the NA cars get that the euros dont. Supposedly it gives like 10hp by removing it. Is this true and if so does removing it hurt anything and does anyone know why we have it and the euros dont
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  #23  
Old 09-05-2006, 01:45 AM
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AA makes software. Works pretty well as I have it on mine. The charcoal filters don't do shit.. only there for emission reasons. I have them removed. With the both mods in place, pretty significants gains on the dyno on both HP and torque. Can't justify at the moment on spending 7G's on headers though.. The price will come down..

Quote:
Originally Posted by DINANM3
So I guess headers and exhaust and first on my list of mods when I get my E60. Im sure you will need a software upgrade for that kind of mod. does anyone make it yet for a car with exhaust mods. By the way are there any intake mods out yet. And whats up with that extra filter the NA cars get that the euros dont. Supposedly it gives like 10hp by removing it. Is this true and if so does removing it hurt anything and does anyone know why we have it and the euros dont
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  #24  
Old 09-05-2006, 10:00 AM
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Of course I did not mean just throw on headers without an exhaust...however from what I understand from many in the bizz including Turner Motorsports, Metric Mechanic, etc. the place you create the most hp (from the engine to the pipes) is straight out of the engine (i.e. the headers) you are not going to get any real gains with an exhaust system. While I don't know anything about the M5 exhaust system other than what I have seen, these are the general rules: You have to create a way to get those hot gasses out as quickly and efficiently as possible. Headers and jet hot coating are not just BS they work...exhaust systems may sound great but they really don't do much for improvements in hp. Just my .02
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  #25  
Old 09-05-2006, 01:39 PM
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here's the problem, yes header out will create HP, at the huge expense for torque. Replace with a better flowing exhaust with high flow cats will give you HP and torque improvements. The whole point of Jet Hot or any other exhaust wrap is the the exhaust itself to retain heat within the header so it can evacuate the hot gases better. (same as ceramic or inconel headers).

Quote:
Originally Posted by ljnlaw
Of course I did not mean just throw on headers without an exhaust...however from what I understand from many in the bizz including Turner Motorsports, Metric Mechanic, etc. the place you create the most hp (from the engine to the pipes) is straight out of the engine (i.e. the headers) you are not going to get any real gains with an exhaust system. While I don't know anything about the M5 exhaust system other than what I have seen, these are the general rules: You have to create a way to get those hot gasses out as quickly and efficiently as possible. Headers and jet hot coating are not just BS they work...exhaust systems may sound great but they really don't do much for improvements in hp. Just my .02
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