| To be specific if all you change is the headers to true dual headers, run the stock mufflers and air filter then no tuning is needed, it will run about like it did stock, which IMO is just too lean but it won't hurt it.
Now you drop on some better flowing mufflers, V&H, Rush, Wild Pigs whatever and you are leaning it out more
Pop on a free flowing Ness Big sucker air filter kit and lean it some more
Then you need to add a tuning device either a powercommander, v&H power pack or SERT and change the map. |