Engine Mounts keep braking

Hey guys, I have a modified 99s40t4 5 speed manual. 15psi boost, heavy duty clutch and preassure plate, 3" from the Turbo, 2" lowered all round, heavy duty springs shocks and a 26mm front sway bar. I keep braking engine mounts and they are costing me $103 Australian, every time. I thrash the shit out of it every day and wish to keep doing so. Is there heavy duty engine mounts available? how much? where from? My diff is starting to get a bit of back-lash too so Im also looking for a racing 5 speed and LSD. Are there any available, how much and where from? Can I order a range of different ratios for my gearbox and diff? Any info is appreciated but I cant read your replies until monday.
Ps Im in AUSTRALIA.

hmmmm try www.kalmar-union.com they have LSD's for S40's
as for engine mounts try emailing them to see if they know of someone.