no sputtering, full power, and launches hard now. i'll take it to the track in a couple of weeks. bd claims the limiter is raised to 130 mph, but we only got to 123, thats with 3. 73's and factory tires. injectors, bullydog box, no muff, and a k&n, went 14. 76 @94 in 4x4. i'll post after the track. worth the money?, for sure!!