Hey, First off and I know this is not the place to say, but my previous profile has been banned for absolutely no reason. Huzidada. Mods please reply to me.
Okay so I have full Uni stage2+ and all supporting mods on my R. ITS A DSG. Already had a GFB+ but just for laughs and giggles I purchased the CTS BOV kit.
Firstly as everyone stated, awesome build quality and packaged with everything necessary with easy enough instructions.
Car felt awesome and pulled awesome, no trouble codes etc.
So did some logging. CTS had been installed on car for about 3 weeks now. Perfectly adapted etc.
After logging, the CTS I waited 20mins and installed the GFB and logged immediately. After logging the GFB I reinstalled CTS and did one more round of logs.
What I found is boost came on a little stronger, a little faster and lasted just a little longer per RPM with the GFB installed. Car felt a lot smoother even when driving normally to my "test spot".
I did a 4th gear 80 to 160kmph pull on the exact same stretch and both still managed the exact same 6.7s time.
So even though the GFB has better characteristics, its so negligible that you wont notice it.
What you do noltice is partial throttle response. Theres a very slight delay with the CTS. Especially on downshifts and when playing with the accelerator through the twisties.
Its not very noticeable to the average driver but for someone that depends on good response and a balance/smoothness while tackling the twisties, its an irritating feeling.
Conclusion, both excellent products. My fuel trims excellent with both and straight line performance was near identical for both valves. Both are excellent buys.
But the GFB is the slightly better driver choice, not only for the price point, but for partial throttle(hope Im using the right word) response.
Hope this helps.
Cheers