I looked at getting a set of extractors for my 4.6 back in 2007, but the cost was prohibitive. A set of 4-2-1 made specifically for the role would have set me back over 2 grand! :shock:
Then on top of that there is the cost of ceramic coating both inside and out, as using them without would be unthinkable. The heat given off will melt plastic and rubber parts with considerable ease, plus the life of the tubes are compromised.
When they crack, they'll have to come off again, and all that money I would have spent will have been for naught.
Sure they will make the engine sound good, but in terms of a performance improvement, for a road going car with an automatic transmission (my Rover), any difference would be negligible.
Ron.