I spent many hours last fall searching for "the one perfect TB kit" and I don't think it exists. IIRC Europa has a page where you can "build your own kit" but it's really just a glorified shopping cart. The Litens tensioner is a clear improvement over the old style "hydraulic" one. This kit
https://www.fcpeuro.com/products/audi-vw-timing-set-ina-06b198119a
is the only one I found that provides all the pieces needed to do that upgrade, including a genuine Litens brand tensioner. Even if you don't want the belt it's still a decent deal. Ina is a trusted brand. For the other pieces like WP and t-stat I recommend researching and buying single pieces.
The Achilles heel of the Litens tensioner is that the death grip of ONE NUT is all-important. If that nut slips for any reason, ever-- disaster! After finding this out the hard way I took no chances the second time. Thread-locked the stud in place (deep enough that the tensioner definitely seats against the head) and used a Nordlock washer under the nut. Nordlocks replace the usual flat washer / lock washer combo and compare to them like Audis compare to Yugos. That nut WILL. NOT. BUDGE. until you make it budge by gouging out metal on both of the washer's large contact faces / that metal's shear limit is the locking force on the nut. Expensive for a washer but cheap for peace of mind.
Now, since you drained and re-habbed the cooling system, you want to do a FLUSH too, right? Man, that M-F'er is even more time-consuming than the TB job if done right because of all the drains and fills involved.
re: Gates kevlar belts: the word "kevlar" makes for great marketing hype, but in this application chemical stability over time actually matters more than strength when new. Conventional belt materials are selected to maintain their strength under engine compartment conditions and do so better than kevlar. Gates calls it a racing belt, which is exactly right: fantastic strength for a few thousand miles after which you're gonna tear the engine apart and replace it anyway.
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