Just wondering, How important is the CS injector on a stock 5kTQ? And, How much d oes it affect the engines performance? Will a bad CS injector make it run roug h, or bad in cold weather? And, is it a good idea to replace (upgrade) this pa rt as the car gets older? Can the Mercedes V8 CS injector be used on a 5kTQ also, or is this useless? Thanks. Later, Dan