Thorley header, cat, 2 1/4 exhaust, straight-through muffler...
Massive improvement in power. I can pass people on a 5% grade in 5th.(ie - pulls up a 5% grade now at 70mph+) Gobs of power at low rpms as well, and engine cleanly revs up to 5K. Lost 2mpg highway though - but I suspect that's because I'm driving 70-75 on the freeway instead of barely making 65...
Nice to keep up with traffic for a change.
ie - the exhaust is in the plan/budget you said... but without a proper header, it's largely wasted.
