Aftermarket horns, supercr@p, Ripco have em or visit wreckers for euro's or look around wrecked Japa's for the dealer upgrades... I has em they be loud...
Just buy new hubs mate
Can get them from Supercr@p cheap cheap
Or go to local trailer manufacturer they will have some (for instance I got some from the guys that built mine Briford trailers)
Oh and Booya baby:
https://www.google.co.nz/search?q=trailer+hubs&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a#q=trailer+hubs&hl=en&client=firefox-a&hs=OlZ&rls=org.mozilla:en-GB:official&prmd=imvns&source=lnt&tbs=ctr:countryNZ&cr=countryNZ&sa=X&ei=tiAqULPZO4-imQWJtYCIDA&ved=0CFAQpwUoAQ&bav=on.2,or.r_gc.r_pw.r_qf.&fp=8c67ee93f45e31b8&biw=1280&bih=642
Both
Cheaper at Supercr@p, comes in small 50g tubes, use sparingly and apply to both sides of the gasket.
Clean both surfaces with acetone (nail polish remover) or use Prep-it (or similar pre-paint prep cleaner) before applying.
If you are willing to use Mobil the the Mobil in Amberley has Synergy 8000
Excel spread sheet for Mobil
http://www.farnorthfuels.co.nz/pdf/Mobil_south.pdf
Mobil Amberley
http://nz.mobilstations.com/locator.php
I know of a ol school club subber from waaaay back that had a V3 that had 450horsies while being run in... and while he was doing development work on it...
Can be done with right tools, right gear and right approach oh and deep pockets/huge debt
It is the "flux capacitor nuclear thermo switch thingy giving you the countdown to death of car" because muppet owner runs engine with no filter...
Better examples to be had by the sounds of things
Same
Reality is it is a b!tch, reason why I never took the beast over.
Have heard and seen horror stories where people have had to swap out all airbags and seat belts.
One guy had his V3 refused at border entry because he did not get a refrigerant clearance PRIOR to shipping...