[Alex.J]

Hi guys,

While I like my BCS back box I'm trying to get back to OEM+ which was my plan for the car!

So, I'm after either a full or just a back box from a 330 or 325 but must be oem!

Thank you

[makkan00]

Alex
I assume if you do that, you are decreasing back pressure, and potentially some gains?
Any harmful effects?

[Alex.J]

Originally Posted by makkan00

Alex
I assume if you do that, you are decreasing back pressure, and potentially some gains?
Any harmful effects?

Well I already have an aftermarket back box on Sam, so would only go closer to standard!

But with turbo engines they don't rely on back pressure as much as an NA engine so exhaust changes are much easier to do!

Technically, I could run no exhaust!

Ha

[makkan00]

Originally Posted by Alex.J

Well I already have an aftermarket back box on Sam, so would only go closer to standard!

But with turbo engines they don't rely on back pressure as much as an NA engine so exhaust changes are much easier to do!

Technically, I could run no exhaust!

Ha

Thanks for explaining and good luck with the hunt. I remember that acerboo was selling one long time ago.

[Alex.J]

Sorted!

Thanks all! and Thanks Safety_James

[Icekube]

you need to be getting yourself a de-cat to match the new larger bore exhaust

[JP.Williams]

not sure if it can be made to fit the E91s but worth a look ...

http://www.ebay.co.uk/itm/Bmw-E92-E9...item4ad0d74c9d

remember seeing it for sale on here not to long ago either, must be a member.

[magic77]

I went with a BCS back box and then replaced CAT back with just a straight through pipe.
Sounds great , goes well and looks very good and cant be more pleased with it.

Its true you could run a D with just straight through pipes with noise increase is minimal. Couple of users have done this few videos on here. The BCS box gives a resonance effect giving a better noise and slightly masking the D sound

[Alex.J]

All sorted now !

Thanks everyone! BCS for sale !!