jbrefol Posted March 17, 2019 Report Share Posted March 17, 2019 Will it affect my Air fuel ratio ? My car was already tuned by my tuner when i was using a 4 1 header and 2.5" downpipe and exhaust. And changed it to 4 2 1 header same downpipe ang exhaust. Im.using a link moonsoon ecu Quote Link to comment Share on other sites More sharing options...
Stevieturbo Posted March 17, 2019 Report Share Posted March 17, 2019 The only answer is it may do. How much difference it will make will depend if the new setup is better or worse, and how the car was tuned in the first place. Quote Link to comment Share on other sites More sharing options...
Rossobianconero Posted March 27, 2019 Report Share Posted March 27, 2019 just log the car and see if is close to the AFR target or too way off. I'm guessing is a NA engine so the chances of kill the engine for a little change in the lambda is low, post a log on your new setup and tell us a little bit about what engine are we talking about. Quote Link to comment Share on other sites More sharing options...
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