I put a TRD exhaust on my 07, no noticeable power increase except for maybe a bit of a nudge at top RPM, and I was highly disappointed with the sound. It was a nice rumble, with very little cabin drone but I was looking for something much more aggressive.
The reality is you're not going to see much of an improvement with any aftermarket exhaust setup unless you do headers, high flow cats and a cat-back.
I would recommend having a muffler shop just weld in a Flowmaster or something similar to your existing setup if you just want to make some noise for cheap.
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