26-07-2006, 09:48pm
Never acheived above atmospheric on the engine side of the filter but the vacuum did start to reduce above 100km,hr and at 140ks my turbo diesel would make about 0.5psi extra boost because of the better breathing due to a forward facing intake.Slight restrictions on the intake affect engines proportionally more than slight restrictions on the exhausts.All air pumps push better than they pull.Its all good just don,t do it on the road on a bike.Dyno possibly if you,re curious but i wouldn,t expect much. Glenn the Spa Man<i></i>