I sure could feel the difference on mine. I bought one today for 20 bucks. Threw it on but had a few probs gettin it in there right. But, I could really feel a better grunt in the low end R's. Like coming out of a slow corner in first, it picks up alot faster than it used to. I would recommend one to anyone now. People said to me many times that they dont work, but I had to see for myself. They couldnt be more wrong. Could you feel a difference when you put a boost-bottle on?

 

I saw three goats name peter paul and marry they have blue eyes and spoke or cherries, i knelt down to pauls ear and wisperd to him "paul where do you keep the magical toilet brush?" Paul leaned over and looked me in the eye, and he said "Jeny, why are you talking to a goat named paul?" And at that very moment I relized...I enjoy water skiing.

 

What the HELL are u talking about HarleyGuy? It was funny as crap though..

 

I got mine thrown in when I bought a set of Toomey T-3's a few weeks ago for $50 (Hey, he offered them to me at this price). I put it on my playbike and noticed no difference.