Well, I did APR 2 weeks ago and before doing it, I went and installed the DV from AudiTT, which, according ot other people (search through various Audi forums) is better than the stock one.

It took me 30-45 min, no rush, wanted to make sure I don't f..up other wires/hoses.

I bought this one
2001 Audi TT Quattro 1.8 L4 - Overrun Cut Off Valve - BUY 2001 Audi TT Quattro 1.8 L4 - Overrun Cut Off Valve

but your would probably be the same or similar

 

This DV/BOV discussion has been beaten to death.
Use the search button please.

 

bbboy: thanks a lot. [I have ordered an APR R1 DV...]

 

I like the APR setup as well, It might be just me but I feel better not mixing and matching parts and chips. You can use APR to go all the way to stage3+ with using all of their stuff, so you know it will all work together.
Thats just me......

 

I've got the APR Stage I... Wow!!! This month special included 4 Programs, and all the options.