How close to exhaust outlet is it OK to wount WB sensor to?
 

Going to change my exhaust around and it will be shorter, how close to the exhaust outlet is it Ok to mount a WB o2 sensor and have it be accurate? On the dyno they just have it a few inches in the tip, but I need to know for sure so i can weld a bung in there. Will it be OK about 6-8" inside from the turndown?

Thanks

If you're welding in a new bung anyway, why not put it just after the collector? More accurate reading there IMO.