2006 E85 3.0si Backbox undelete

[Nota TR5 man]

After reading this I now know I am not the only one one who dislikes the popular trend amongst quite a lot of young drivers of all sorts of vehicles who delete their back boxes and annoy every one else as you can hear them coming from miles away. The Z4 does need to let the big six sing a bit more and if I could have it sound like an old Jag or Triumph it would be ace. When I built my special spring rates and silencing were the difficult things to get right, in fact my wife laughs at the many springs and silencers in the garage

[GP06Roadster]

Agreed, I hate the currently spate of pop pop droney (is that even a word?!) exhausts. How these things are passing mots

My neighbour has a Triumph GT6 which sounds ace!

[thecremeegg]

Go on ebay and message people breaking Z4s is one method, get a replacement box off them

[Inline 6]

The garages I’ve spoken to about welding a replacement back on have told me not to do and just buy a complete system.

Well, they would wouldn't they...

I've had one of Mike's adapted back boxes for over two years (I opted for a slightly softer mod than his normal) and it's still sounding great. He doesn't weld the box on, it's connected by using sleeved sections bolted on, which is the method you could easily use to un-delete yours. I would guess it all depends on how much was cut off when the box was removed. Beware of getting a replacement box with only an inch or two of piping attached - that would be a pig to work with and need welding; you probably want a box with around 7 inches of pipework attached. And make sure the box is post-facelift as the pipes are different I believe.

Where can I get hold of ‘Mike’?
I’m interested to know more about the ‘softer’ sounding mod.
Is generally quieter?
What I’d really like is something that had a valve to alternate between a standard sound and a more open one.

[Zulu4]

After reading this I now know I am not the only one one who dislikes the popular trend amongst quite a lot of young drivers of all sorts of vehicles who delete their back boxes and annoy every one else as you can hear them coming from miles away.

#Me too.

A few years ago I had a Citroen C4 VTS (looked nice but it was a slug). It needed a new exhaust and Citroen wanted £1000, so I got a specialist in Walsall to make a stainless steel one. I asked them to make it a quiet exhaust. When I came back and tried it, it was the noisiest car I've ever owned and I felt like a complete plonker driving it. I asked them to fix it, but it was just as noisy.

I couldn't stand it so I part-exchanged the car a couple of weeks later. I told the salesman it was a bit noisy, but he didn't seem bothered. As I drove my new car out I heard the roar as the salesman started up the C4 and I felt bad

P.S. Sorry if you live in Walsall, but I never, ever want to go back to that place. It's horrible.

[Sidewaze Samm]

Where can I get hold of ‘Mike’?
I’m interested to know more about the ‘softer’ sounding mod.
Is generally quieter?
What I’d really like is something that had a valve to alternate between a standard sound and a more open one.

Mike is in the north west near M6/M62; he's fallen out of favour with the powers that be on this forum (long story), but a lot of forum members are very happy with him. He has a presence on facebook (zed shed) and is on 07973 540495.

The softer sounding mod is simply not as modded as a full mod
You still get more growl and volume than a standard box, with overun pops, but at a more subdued level that in my opinion is wholly acceptable and a world away from the boy racers in their civics and ST fords, and nothing like a back box delete.

Switcheable valve? I'd say that was wishful thinking...

[Motionblurrr]

I'm older now and I never did a backbox delete on my Z4 (even though I came very close to!). I *always* wanted to do it. I just couldn't risk getting an angry neighbor dig their keys right into my paint because I would sometimes arrive home late after midnight. I know what it's like for a neighbor to have a noisy car and it's not fun at all, especially a cold start.

All these years have passed and I'm glad I didn't do it now. It's super nice to just drive somewhere and not have it drone or wake up the whole neighborhood.

I can make the car burble and pop with the stock exhaust too! You just have to blip the throttle around 3,000rpms (and I mean lightly tap) and you get your burbles!