I just got my TRD exhaust in yesterday and bolted it up this morning. It was cake. Two bolts and three hangars and it was done! Less than ten minutes!! I haven't driven it yet, but I'll report back on performance changes, if any. Save yourself some money and install it yourself. The price for the exhaust from Toyota Parts was $485.00.
BTW-The sound is just right...a little throaty, not too loud and definitely not ricey!!!
Just drove it about 25 mi to check out the TRD exhaust. Mid-range from about 2500-5k seems to have a noticeable improvement in throttle response. Too bad the low range (0-20 MPH) still lags a bit, but then again it is an automatic. I'm hoping the CAI will take care of that. All in all, I'm happy with the TRD exhaust.