take a look at my LRD 350b in the for sale section. 2ndmoto said it was a basically a 250b pipe but I have both and it definitely measures up bigger.
Sorry Hub,
I must have no explained myself vey well. The 350B is a modified 250B. Basically it is a 250B pipe with a larger tail pipe. So the converging, diverging and center section are all the same. LRD then developed the 350D pipe which was a complete redesign for the larger displacement power valve motors.
The 350B pipe does compensate for the larger exhaust volume and allows for proper jetting. I am running one on one of my BB motors, ad it does perform well. I would say the 350D and 350G pipes make better power (at least on the motors I have owned). I have a 350G on other motor and have used a 350D before.
Best Regards
-Jason