Quote:
Originally Posted by Detoxing
This.
Tunning is something you do once you've added other modifiers because it's sometimes required with increased air/fuel. I mean, if you're just adding a new air intake and some exhaust mods, it probably doesn't need it.
Otherwise, the factory settings are about as dialed in as it gets.
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For the most part this is correct. There are subtle things that can be done such as shift points on an automatic transmission to improve drive ability and adjusting the fuel air mixture tune, I know like my car for instance is set to the rich side by GM.
If you put headers on a newer vehicle you can pretty much be prepared to have to get the car tuned. Its eventually going to throw a CEL because the O2 sensors aren't going to read the exhaust correctly due to the increased exhaust flow over manifolds.
For instance changing to a 3 inch cat back exhaust is only going to improve sound quality, only performance improvements will come with headers with some high flow cats behind them. Most stock exhausts flow pretty well, but are somewhat restrictive to suppress for noise.
Removing the stock air box for an after market cold air intake will provide some varying increases in HP and Torque. For all intents and purposes stock air boxes flow well, but are also baffled to suppress noise during acceleration.