Here's a fun story. I purchased a Conti timing belt for a 2004 Golf TDI BEW engine code back in Jan 2009. I installed it, along with new INA rollers and a HEPU water pump on a friend's car: basically, all OEM or better than OEM quality parts.
She drove the car for 3 years, and put 60K on the belt. The other day, the belt exploded. I mean, there is nothing left of it except shreds. My initial thought was that the car dropped a valve, or the tensioner rollers or water pump siezed. Nope. Everthing was fine, except for the collapsed and mushroomed lifters, bent valves, scored camshaft, and impacted pistons. The rollers and water pump spin like brand new. The cam gear had not moved, and I had inspected the belt at her last oil change.
I've used Conti/ CRP parts for over 2 decades and never had a problem. Now this.
I've generally watched the quality of their parts slide over the past decade. From CV boots that dry-rot after only 2 years, to V-belts that stretch prematurely. Customer service basically told me to go f*ck myself on any sort of warranty. 12 months, 24,000 miles is all they cover, unless you buy their complete kit. Apparently, you can't use their piece of $hit belt with better quality parts, or it will explode.
If you EVER do a TB on a VW, diesel or otherwise, I would strongly suggest that you consider Dayco (another OEM supplier, and the co that makes nearly all the belts for VW right now), or Gates.
I will NEVER use Conti/Continental/CRP products AGAIN. If you value your car, or your car repair business, I would suggest you do the same.