Level 10 and Import Performance Trans are arguably 2 of the best in the business...but some of their products are simply reselling parts from someone else. For example, the valve-body kit they sell is actually made by Translab, but IPT sells it as their own and charges more for it.

For those who aren't aware, trans mods will help increase the life of your transmission--even without additional power. But--as with most mods--you sacrifice something to get that. Mod it for rock crawling & it won't be as well mannered for grocery-getting. With a transmission, the mods usually have to do with line pressure. This makes the shifting snappier and abrupt; opposite of how stock transmissions are. For some people this doesn't bother them, but if you don't like "harder" shifts, then trans mods (at least to the valve body) are probably not a great idea for you.

That said, I'm planning to add the same longevity mods to my VX trans as I have in my GTO; a heat exchanger & one of these:

http://www.magnafilter.com.au/magnefine.html

Only problem is, I'm not exactly sure where to put the heat exchanger. I sure as **** don't want to cover the radiator any more than it already is.