Don't swing so fast! ;-)

Seriously, I have not heard of that problem, but am interested to hear whether you see much difference between the TS2 and the TSi3. I'm considering the same upgrade myself.

If the TSi is that much better I'll live with any whistles! LOL

Well it does jump right off the face, I have had both and I like the way this TSI comes through the surface. I probably should have reached out to the golf shop that I got this from but there are no cracks or any reason to make the sound but it literally sounds like A small hole like a very low swoosh or whistle, I may just have a one off lol

Well it does jump right off the face, I have had both and I like the way this TSI comes through the surface. I probably should have reached out to the golf shop that I got this from but there are no cracks or any reason to make the sound but it literally sounds like A small hole like a very low swoosh or whistle, I may just have a one off lol

I've heard others mention a similar whistle with the TSi FW.

I have just noticed the same issue, except with my tsi3 driver. I didn't notice it until i replaced the shaft with the same shaft I have used in the last 3 models. I don't see where it effects performance but it makes me think something is wrong because it shouldn't be "whistling" at all. Curious if you ever found out your issue of why it was doing it?

Same here. I noticed right away that my TSi3 driver whistles on the downswing. My first thought was that my weight is sitting in T1 and maybe when they did aerodynamic-type testing...they only tested in the Neutral position? Not sure but I have not found it to be hurting performance. This club is definitely longer than my TS3 and the TS3 was the best Titleist I had ever played. Popped 4 drives over 300 yds last weekend which is huge for a max 100mph swinger like myself.

I have a TSI3 driver and fairway metal no whistle sound.
Have weights in heel.