Same here, TSB done vibration is actually worse. Complained to the service manager. We took another RX out and he agreed mine had more vibration but there really isn’t anything he could do. Over a year waiting for a fix and this is what we get. What a joke, So disappointing.

[QUOTE=rraheja;10101980]The TSB involves changing the entire center exhaust pipe with a new one that has a damper already welded. The TSB even goes as far as to mention this will REDUCE the noise, NOT eliminate it. Am just wondering if adding a second damper would have eliminated it why wouldn't they have done it if they anyway waited for a year+ to issue this fix. All logic aside, the consumer in me just wants to put the second damper anyway to move on even if it costs another $50 out of pocket. But having no experience in car repairs, would appreciate if anyone here who had already put the dampers before can try out their dampers with the TSB applied.

I am going to install my two dampers in addition to the TSB. I hope I get the same results as before. Now with a completely different pipe it might have changed the resonate frequency, in my case it was a negative result. The service manager checked to see who worked on my car and said it was the best Tech they have and would trust him with his own car. Dealer and service manager are really nice but to be honest they are caught in the middle of a bad design from Lexus.
Whats difficult here for Lexus is the inconsistency from vehicle to vehicle. The loaner RX they gave me had horrible Drone but no vibration. Mine has very little drone but noticeable vibration. Manager said trying to get a fix that would address both is very difficult. Just strange that with all the cars Ive purchased over the years none have had a characteristic like this. Really suprised that Lexus still has this in production with no resolve.

I’m not advocating for any attorney & I’m not being a hater. Those that have had this TSB performed & are still having issues, need to get their ducks (documentation) in a row & open up the highest level case with Lexus as possible. Also, start talking with lemon law attorneys. This isn’t going to get any better until there is a total redesign. Apparently, Lexus thinks this is a small problem & not worth messing with. Do you want to be miserable every time you drive your new Lexus? I wouldn’t. Brand loyalty went out the window years ago. It’s all about corporate profits now & very little to do about customer satisfaction. Put your loyalty aside & take some action. Also, talk with your dealer General Manager & tell them you are are really dissatisfied with your Lexus purchase & see if they will trade you out with little to no money. It’s worth a shot. I feel for you guys that have this problem. As I said earlier, I’m not a hater. This is my first Lexus, but I’m not sure I would buy another anytime soon, based on how they have handled this & the mediocre service I have received. I just don’t see that much of a difference from other brands, but I’ve only delt with one dealer so far.

Great point! I have wondered something similar - if anyone had replaced the factory exhaust with something different. A well engineered performance car (hot rod) may be louder, but it doesn’t drone & it produces more power where it’s needed, either top end or bottom end. There hasn’t been enough research & testing put to this issue yet. Perhaps some individuals will come up with a fix...

I reinstalled my dampers and it didn’t help. My vibration seems like its in a greater range now. It starts around 1300 up to 1800 rpms. Should have left it alone, this TSB was the worse thing I could have done. Im going to try moving the dampers around. Absolutely ridicules that I have to be under a new vehicle trying to fix what shouldn’t be broken.

I caution anyone who is about to get this TSB done. It could actually make things worse!

Can you ask for your old parts back? I had a Buick once (back when the max speed limit was 55) that the transmission would flutter between 40 & 50 mph. They had a TSB where they changed the chip that changed the shift points. The flutter went away, but my fuel mileage went from 26 mpg highway down to 22 mpg highway. That was a huge difference for me as I was driving several hundred miles every few days. I had them change it back & I put up with the flutter.

I suggested they put the old pipe back. Service Manager would like a Lexus FT who comes once a month to drive it and make the case that it has more vibration than others. I know he will drive it and chalk it up to a normal characteristic of the vehicle. Really tired of this, to be honest, I have a year and a half left on the lease. If I had purchaed it I would just trade it in and not for another Lexus.

The new pipe is physically different, looking at your pic I placed the two dampers at the very bottom. That's pretty much where I had them prior to the TSB. I just moved them right in front of their damper. Seems slighty better. It's so weird, when the exhaust is cold it's slight. It gets more pronounced when the exhaust gets up to temperature. So frustrating.