You'll need to be a bit more specific. For example, Range Rovers used the old Land Rover V8 dating back years up until 2002 in the P38, then went to the 4.4 BMW in the L322 up until 2005 when it was replaced with a Ford 4.2 litre job. Year of manufacture will be a factor in the others too.
and it's not the manufacturer of the kit you need worry about but who installs it. Even the best kit bunged in by a numpty won't work but the cheapest of the cheap, installed properly will work fine. Just not for that long which is why they are cheap......
'96 Saab 900XS, AEB Leo, sold
'93 Range Rover 4.2 LSE, Lovato LovEco, sold
'98 Ex-Police Range Rover 4.0, Singlepoint AEB Leo, my daily motor
'97 Range Rover 4.0SE, eGas multipoint, a project.....
Proud to be a member of the YCHJCYA2PDTHFH club.