I have TD2. It came with the Jeep. It does feel peppier in the 91 octane tune vs. stock. Have not tried the 94 tune yet. However, it's all seat of the pants feeling. Only dyno would tell for sure. Also, with high gasoline prices I tent to run it with 91 tune/87 octane fuel most of the time anyway. It seems to suck a bit more gas that way (up to 2l/100km more) but I save even more per fillup. I think this engine would be a hoot in a 2000lb car or in a Willys. TJs and JKs should come with a proper V8.