Being a bit of a detective: Putting your Forum moniker, the phrases '160bhp and rear wheel drive' together, would I be right in thinking you race an Alfa GTA or similar?
If so, and you ever look at replacing the Gripper diff, I can highly recommend the OS Giken diffs for 105 (or 101 in my case) Alfas. Much, much quieter than the Gripper, and very well made.
Been using one for 5 seasons of hard(ish) racing, and only now am I thinking of 'tightening' things up a tad now.
Don't know if they're available in the UK yet - I bought mine from the US, and Paul Spruell stocks them over there. Not cheap, but a good investment!
See:
http://tinyurl.com/3v3fcto
Charlie at Cloverleaf Transmissions was so impressed when he built my axle, that he wanted to import them...
Of course, if my deductions are wrong, and you DON'T drive an Alfa, ignore what I've just typed...
