Evening all,

So I am just about to change my exhaust on my Saph which is a 4x4 with 2wd conversion. The current system is a 2wd with a lambda boss welded on the down pipe.

The system which will replace it is a mongoose 4wd full system which I noticed tonight has no lambda boss. Not a big deal - will get one fitted prior to going on...in fact was going to install a second for AFR metering
....... but got me thinking:

1. Suprised being a 4x4 system that the Mongoose doesnt have the lambda boss installed
2. Pretty sure my car had a lambda installed from factory being a 1992??
3. With my car having a lambda, does this mean I have closed loop? How would I otherwise tell if I have this feature??
4. Back to my original plan - installing the additional boss, where is best to have this done??

Cheers
Huw