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I'm most cases no...you don't have to change them. the factory ign wires are quite durable and usually last many many years. this I got from bmw tech back in the day when they were abundant. However, as stated above with age and I mean AGE they may crack causing misfire or arching. the reason most don't change them is the cost factor. they are not cheap.
if you are referring to "noticeable improvement" being..."running properly" then yes..LOL!!
I think I've had 14 bmw's in 4 years.
2 IX's -sold and parts
2 325i 4 dr - sold
4 318is all white - sold and parts
1 87 325is red - parts
1 89 325i vert grey - parts
1 90 325is white - keepin
1 87 325i vert -red - keepin
latest addition 1 88-325is red - parts
latest addition 1 89-325i vert - white -fixin/sold
latest addition 1 92-318i vert - blue - parts
latest addition 1 87 325is blk - parts.
latest addition as of 2013-Gold 87-325is auto! it's a keeper!