I had some free time this past week while I was in between studying for my classes so I decided to do the deckplate and ISR mod.
Here's a picture of the deckplate mod.
For the ISR, I went to a local muffler shop where they cut a piece of stock metal to length and expanded the ends to the right diameter. I then painted it with high-heat gloss black paint. I also got some 7/32" hoses to replace the old one coming from the ISR and the FPR. This was the final result.
These two simple mods made the car sound much deeper when I was giving her gas and quieter when I was cruising which was more than I could have asked for. I don't really know if it gave me more power or if I'm just feeling it, but it does feel like it can get up and go a bit quicker.
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1999 Black SR5 Highlander 4wd V6 Automatic (
Build Thread)

2001 Millennium Silver SR5 Sport 4wd V6 Automatic
(Build Thread V2)