I've got an APR ecu but some times the car feels down on power. The TBB looks fine. What do you guys recommend for a bypass valve. I checked the archives but saw the usual arguing.

My Bosch valves sometimes were a little slow on the pickup. I find the biggest power hogs differences are hot weather and the AC.

...it would always be down on power. If it was a piston-type valve (like the Forge), it could stick open or closed or maybe not close all of the way.

...about 2 and a half months of hot weather testing in my S4 in Houston.

if it does it all the time and its noticable difference if could be a problem with the MAF
sensor

I have a 2001 6speed and I am having all sorts of weird problems. Even when I turn the chip off I can hear a little whisle under WOT. I turned the chip back on after driving with it off for a week and yesterday I had a dragster....It ran better than ever before!!! I haven't had any problems today but they come and go...... I am thinking of having the chip "de-installed" and letting Audi take a whack at it.....thoughts????