First off, I should say that I am in love with my 2008 Toyota 4runner. The only thing I would change is how loud it is. I am not looking for a roar my windows out of my car, I would just like to know that something is there. I don't know about the other models, but the stock 4th gen v8 sounds like the engine is in "luxury" mode. You really have to punch it before you can hear anything. I know I can replace the exhaust, but I am quite hesitant spending $500. Any suggestions?