So, been ages since i updated this thread. Probably the same time since i did anything to it...
Been dying for this upgrade one day, so i finally bit the bullet. Upgraded the exhaust with a Beaudesert Exhaust System. As i was quite fussy as to what i wanted it took some time to get in right. So now it is not either of the standard offerings off the shelf, 1st was to load (Muffler delete pipe fitted), 2nd to quite (Huge Muffler fitted). The 3rd is just right running a 30% smaller muffler than their standard mid muffler.
So now i have a nice sound in the car, when planted you know your on a V8 and nice drivability with the van on. No drone, but note in the 1800 - 2300 RPM range (towing range)
The primary reason for this upgrade was breathability for the next mod. I remapped the ECU, this was a mild remap for a good tow car, and not a street racer, with an improvement in fuel economy. Can i say very happy with the result. The graph suggest it will do a lot better as a tow car (that is next week) Since doing the mod, i am looking at about 2.2 L/100 improvement. Improved throttle response in heavy traffic off the mark. Overall acceleration, is better when stood on but this is subjective.
My DYNO run, top 2 lines are Power (at the wheels) The bottom cluster is the torque.
For those a little unsure of the difference,
POWER - How fast you hit the wall
TORQUE - How far you take the wall when you hit it.