ultimate exhaust for the Z4M?
- Thread starter sammyz
- Start date
I was talking to the guy who fabricated the straght through system for my car. I was thinking of changing the back boxes.He's been building exhausts for years but like most of his ilk will always tell you that a straight through system is better for MPG & BHP than OEM.
Currently the system I have fitted is cat back, resonator deleted, straight through to back boxes with one entrance one exit then a split chrome finisher.( to give the four pipe look) I fancied a more traditional style one pipe in two out box at the rear, as OEM, H & S,Supersprint, Diablo et al. I also fancied just a little more noise
He said in his opinion a 'one in two out box' was more restrictive than a straight through system because the exhaust had to split into two inside the rear box creating back pressure and a loss of power. Also if I used the same boxes as I have now I would reduce noise (not good). I don't pretend to understand the science of why exhausts do what they do and there seems to be a great deal of rubbish written about them.
I may just find a H & S system 2nd hand or order one new.
Currently the system I have fitted is cat back, resonator deleted, straight through to back boxes with one entrance one exit then a split chrome finisher.( to give the four pipe look) I fancied a more traditional style one pipe in two out box at the rear, as OEM, H & S,Supersprint, Diablo et al. I also fancied just a little more noise
He said in his opinion a 'one in two out box' was more restrictive than a straight through system because the exhaust had to split into two inside the rear box creating back pressure and a loss of power. Also if I used the same boxes as I have now I would reduce noise (not good). I don't pretend to understand the science of why exhausts do what they do and there seems to be a great deal of rubbish written about them.
I may just find a H & S system 2nd hand or order one new.
If you're happy with back boxes have a look at Eisenmann...
www.eisenmann-sportauspuff.de
If you have a look at the web site they have videos (Race spec), the E92 M3 is great! Stay away from the R8.
Mine is on order! They do an M system but there's no pics / videos on the site.
I did speak to the factory in Germany (tried the uK and never got back) and they were very helpful, one thing they did say was on the spec, there's really 2 to look at:
1. Race - loud and not advised if you do long journeys
2. Sport - burbles more at low revs and then gets more raucous as you press on (I've gone for this one)
If you look at the link Breaker posted here:
http://www.z4-forum.com/forum/viewtopic.php?f=16&t=16311
In the article they briefly mention the Sport system.
www.eisenmann-sportauspuff.de
If you have a look at the web site they have videos (Race spec), the E92 M3 is great! Stay away from the R8.
Mine is on order! They do an M system but there's no pics / videos on the site.
I did speak to the factory in Germany (tried the uK and never got back) and they were very helpful, one thing they did say was on the spec, there's really 2 to look at:
1. Race - loud and not advised if you do long journeys
2. Sport - burbles more at low revs and then gets more raucous as you press on (I've gone for this one)
If you look at the link Breaker posted here:
http://www.z4-forum.com/forum/viewtopic.php?f=16&t=16311
In the article they briefly mention the Sport system.