We stock all of them here, they are lethal and good for the price.

As far as testing since last season, the outcome so far was as follows:

3PT was lethal on tight short track layout, it out maneuvered any other engine on track when it came to corners, simply lethal. 13T on 48 gearing,

Track was no longer then 320ft.

Temps were tagged on 220 to 235 with 30% nitro on Go cold plug.

Straights were good.

5PT was just as lethal , same gearing / fuel and track.

Temps were much lower, larger sweeping corners were real nice, tight turns and short burst jumps were good but not as good as the 3PT, straight was much better then the 3PT. Could be a gearing choice here or clutch setup.

7PT was real fast, power curve felt like it had some exponential in it, but the sweeping turns and straights are lethal. Still need more testing most likely this season on the new track which is 1700FT long.

All engines were tested on same car same fuel same gearing different days, temps varied a little but nothing major.

Just a note, all the go engines liked a combination of carbon and steel on the clutch.

Go pipe and header were used as well, restrictors were mid sized for all the engines.

These are just our observations here, then again, there way to many variables.

At the end of the day, who can beat them in price quality and performance.