New Group Buy - BB ByPass System 3.2M 3.0Etc - NEW VIDS PG 8
- Thread starter Paza3
- Start date
Are you supposed to fit one for each bank of cylinders to the corresponding tailpipe? I think I read something on one of the threads (poss this one?) that suggested you get an issue caused by differing back pressures - I can't remember if it was rough running or not the right noise. I'm sure someone can confirm.
This is the Coupe rear box
This is the Coupe rear box
Yorkie Z said:
As said in the post above, the back box on the si has 2 inlet pipes as well as the 2 tail pipes. Makes sense to me to bypass both.
I'm sending a cheque this weekend Newbers.
£38.40 all in.
I asked for BMW Z4 3/4" bypass pipes 360mm centre to centre in stainless. They knew what I wanted straight away.
Yes, both si models use the same back box.
I asked for BMW Z4 3/4" bypass pipes 360mm centre to centre in stainless. They knew what I wanted straight away.
Yes, both si models use the same back box.
Anyone got sound clips with his done on the 3.0i? I'm always thinking my 3.0i needs to make naughtier noises.
Marlon said:
No this vid is a back box delete. The bypass only lets around 20% I believe to miss the back box and that's only at full throttle. A full delete is all 100% straight out. When your just cruising the air pressure isn't enough to to push air through the bypass. That's my understanding from a few days of reading up non stop and there is no drone. I think :?
Thanks for the summary 
[/quote]
I think haha :wink:
[/quote]I think haha :wink:
I had this mod done on my 3.0 si about 18 months ago however I didn't think the sound was overly different, maybe its only at WOT as someone else suggested. That said, if anyone is local to me and wants to hear it in action they are more than welcome to come by.
Anyone know if the pipes are welded onto the outer skin or the inner skin?
Pipes arrive this week. Anyone know if they weld to the inner skin or the outer?
Newbers said:
Yeah I've seen the pictures and read every post on every discussion on this and I still can't find an answer. On one post a fellow says he welded just to the outer skin after cutting through both but others have said they welded to the inner one.