[Gunny]

After installing SW headers on my 90 I stayed with the same tune - but only for a little while when it became obvious that I needed to update my chip tune. Marc (others, too) is correct - you need to "fine tune" your engine when making changes to the intake/exhaust system. The only exception I can think of might be mufflers/resonator.

With my limited knowledge it's my understanding that the best tune is with the car in the tuner's hands ... but if you need a really close tune without delivering the car, talk to Marc. He knows/understands the LT5 so well that he can deliver a great tune even when he doesn't have the car in his shop. Best of luck as you get this sorted out.