thats right, the 2630 pipe seems to be the best for the plus. i use it with the short (5 fins) manifold.

Darren Johnson has used on the Euro 2006 in Heemstede the 2601 pipe with the short (5fins) manifold. I talked to him and he said that the bottom power is much better with the 2601. He also said, that itīs more important to change your gear transmission.