2 things please chaps firstly would my 53 regestered 2.5 have the sound generator and I keep hearing about this rear silencer mod where you either put straight through pipes on now do you open the silencer up and do the mod inside the box or just take it off all together and replace with straight pipes
Sound generator /exhaust mod
- Thread starter Paulh
- Start date
The sound generator wasn't fitted to the 2.2 or 2.5 and can be retrofitted but is only piping engine noise in to the cabin,
http://www.z4-forum.com/forum/viewtopic.php?f=30&t=15035&p=1237228&hilit
the exhaust mod is probably a better bet for the money, I'm sure someone with experience will be along shortly
http://www.z4-forum.com/forum/viewtopic.php?f=30&t=15035&p=1237228&hilit
the exhaust mod is probably a better bet for the money, I'm sure someone with experience will be along shortly
elevensies
Member
cut the back box off, replace with 2 straight through pipes, wont be too loud, and will breath a little better
wont add and performance, just a crisper note
wont add and performance, just a crisper note
I am on my second Z4C now!
The first had some foam out of the sound generator, but the current one seems to have a standard sound generator but has a non-original stainless centre and tail section exhaust.
It might be personal preference, but I like the extra exhaust burble from the rear more than the piped induction noise.
So I would go for more exhaust sound rather than a retro-fit sound generator.
The first had some foam out of the sound generator, but the current one seems to have a standard sound generator but has a non-original stainless centre and tail section exhaust.
It might be personal preference, but I like the extra exhaust burble from the rear more than the piped induction noise.
So I would go for more exhaust sound rather than a retro-fit sound generator.
jonathancaddick1
Member
I have tried taking off the backbox and replacing with straight pipes, far too loud in my opinion and the drone is unbelievable. Instead it did the "bypass pipes mod". I have run 2 30mm pipes running from just before the backbox to the tail pipes, running over the top of the back box. It does contact the heat shield which isn't ideal but it sounds fantastic and no drone at all. Could be worth considering?
jonathancaddick1
Member
Stuartt said:
Unfortunately no pictures of my own but below is one that I gave to a local exhaust shop to copy, but I have the 3.0 so there are 2x inlets, 2x tail pipes and therefore 2 pipes running over the top.
jonathancaddick1
Member
To be honest I haven't had an MOT since it's been fitted but as they run over the top, you would never know it's been done unless you removed the backbox, therefore shouldn't be any problems!
In terms of sound, driving normally sounds pretty much as stock if not a little louder (especially cold starts), above 3000rpm it really sounds great and then on the overrun you get some pops and crackles, really notice them with the roof down. Overall, definitely something worth doing. No drone at all, so it's the best of both worlds and only cost me £80. I'll try and get a video soon.
In terms of sound, driving normally sounds pretty much as stock if not a little louder (especially cold starts), above 3000rpm it really sounds great and then on the overrun you get some pops and crackles, really notice them with the roof down. Overall, definitely something worth doing. No drone at all, so it's the best of both worlds and only cost me £80. I'll try and get a video soon.
Ive put some washers between the main pipes and the backbox, basically a tunable backbox delete, only issue is on a cold morning you can see some exhaust creep through the rear left alloy.
