I always lol@ LSD threads because they usually involve a very definite split which goes like this...
Hello, I have an LSD and I'd like to say that it's wonderful chaps. It really helps me apply power to the road and does a variety of other lovely things, such as....
And the other:
Now den geezas. Onli a clwn wud consida 1 o dem trick difs. I as got 689 BHPs an me car is propa fast. U dont even need it man. get a big turbo from old calibra insted on it and save some doh for beer and dem birds and dat.
My opinion, I bought Hurdy's car because it had a Quaiffe diff fitted and others for similar money didn't. Simple as that.
Any car likely to be on this forum (GTI's or ED30's etc) are likely to have enough power to show a signifcant difference by fitting an LSD. Anyone who tells you otherwise is a damn fool. They MAY be expensive (and are) and that is what counts against them.
I'll try give some 'bang per buck' context. In my old 335d I had a remap which brought it up to 540 lbs/ft torque (yeah, over 700 nm etc) and an Autobox which had no idea what to do with it.... I ran it happily, loving my remap and superfast diesel. Then I tried one with an LSD fitted and it blew me away.... It was SO, SO, SOOOOO much quicker than mine because it was actually using most of that torque, whereas mine simply wasn't able to put it down. If it hadn't been for BMW making such a clever Auto I would probably have been dead to be honest.
Sadly, the LSD for the Auto 335d is only supplied by Birds and costs over £2000. For a Golf you're looking at something like £1000 - £1200 fitted I guess. If you have Stage 2+ etc it's well worth it, makes a world of difference. If Clarkson drove my car now he couldn't POSSIBLY say that FWD cars can't handle over 300 bhp. If he did, I would tell him he was a damn fool too.
Matt