I ran the Speed Pro pistons in the TT440. The first set I had was treated viciously and went through a LOT of detonation as I was learning the ins and outs of turbos. When I pulled them out they were scuffed and 4 of them had rings so badly broken they fell out in pieces. Still, the pistons held together.

The second set saw higher boost pressures (surged to 21 psi at one point) and put up with alcohol injection at 15 psi. They were still running in the engine when I sold the car a couple years ago.


They aren't be best thing out there but they put up with my abuse.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon