Just wondering what this black box is for, it’s behind the driver’s side rear wheel.

http://www.performance-zone.co.uk/Images/whatisit.gif

 

Funnily enough I asked that exact same question to the mechanic at TSL while my car was up on the ramps having a Grp N Backbox fitted about 2 hrs ago!!

Apparently it is a carbon box that has something to do with recirculating (petrol or exhaust?) fumes. Sorry... not v technical.... but I lost interest when it stopped sounding interesting!!

 

Dosent sound very interesting....

You pleased with your new Backbox??

 

Aye. It sounds just right burbling along, and is not too intrusive when you are cruising at high speeds. Just what I wanted (OE was way too quiet, but didn't want to wake the neighbours).

Plus it looks pretty stealthy and was only £282 (it is the same one as on TSLs STi in the "TSL new wraparound Kit" thread).