Yodo

I ride sc 400 1994 1uz-fe non vvti. My whole exhaust was rusty and all and they made me o new one, straight pipe config. Now there a re no rear lambdas and I suspect that the fuel consumption rose a bit. How should I deal with it? Should I buy new lambdas or somehow reprogram the ECU ( it's standart, no tuning here).

RudysSC

No need to reprogram or tune, however, you're going to throw a code for not having the rear 02 sensors in. The engine only adjusts fueling from the first two, however, the second two are needed for emissions reasons so you may have a CEL as a result.

notsoarer

you should reprogram some mufflers or silencers into your exhaust