Quote:
Originally Posted by JackandJanet
There are only a few exhaust mods that might effect the tune. Bill could talk to you about those. In general, adding an exhaust mod does not require retuning at all, and, according to several discussions I've read, most exhaust mods have very little effect on performance too. About all many of them seem to do is change the sound. 
I'd say get the programmer now. It WILL change performance (for the better) and will probably save you a few pennies in fuel costs - although the payback time is pretty long. Still, if you're committed to shelling out the bucks for one or the other of these mods, the programmer's the one I'd go for.
- Jack |
Jack does a good job doesn't he!
Adding to Jack's post. As I understand if you go cat back only on the exhaust the customs should not need any mods. Its when the long tube headers, cat elimination, high flow cats and or true duals (any combiation of these) are installed the the custom tunes may need work. But talk to Bill.
Lars