Well I took off my Ivans TRE today just to see how big of a difference there was. I think it made my 041k run bad compared to stock. It seems that when I had it on it was very doggy below 4 grand and I dont think it made my throttle any smoother. As if it needs to be smoother anyways. I rode about 25 miles without it and it seemed like it had alot more get up and go then with it. Does anyone else agree with this. Sucks though that I paid 70 bucks for this thing and I only used it about 100 miles.