When is a tune absolutely needed?

SS_Firehawk

I swear I just got a case of deja vu. I'm not sure which post of culmination of posts brought you to the conclusion. But the intake runners are longer and the manifold is wider (except throttle body positioning). It's going to effectively move your peak power, hence the slight loss most experience up top. I still said he needs a tune afterwards to get the most benefits, but also, running the manifold isn't going to make his car go dangerously lean. I would say most of us know not to tune a car on the edge, or have a tuner push the envelope too far for a few more hp. At 2000ft, I was just over 13 AFR with out tuning. Until my Pre cat O2 sensor crapped, then it just ran rich.

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