Originally Posted by AJ Escos
I thought the twin piston valve was for the small turbo escos, and the single piston was fine on the large turbo version
Yes, that's right, but they both work on the big turbo's. The reason I want a twin piston is because the single piston stay's open at Idle, and make's it sound crap imo (sucking noise!!) The twin piston stays shut!!