I have just installed my new Erlandson performance orange spring (PATV2) into my TrailBlazer. It made a nice improvement over stock. I now have quite a bit more low end. I can ride wheelies sitting down, and only have to pull on the handlebars(finally). If I stand up (on the floor boards not the seat) and lean back a little, and can it, she stands up with ease. Next will be the pipe.

Aaron

 

Make sure that your pipe and clutch are tuned to each other or else you'll be worse than stock.In other words get your aftermarket goodies from the same manufacturer.