It depends on what output level & driveability You want, but most street apps are better served with a compact & direct manifold, lag is reduced with varying operating conditions. A heavy cast manny holds heat in between romps & won't suck the thermal energy out of the exhaust gasses on the next romp as much, & the bigger the rest of the downstream piping the better. Most new engines are 1 piece turbo/mannys, or there aren't even mannys at all, ports merge in head to a rectangular flange...turbo right off head. I've been giving the Ford Ecoboost F150 units some scrutiny, they are unique in form & design, &diff side to side. They may be able to be fitted to Dutras, & sized just right, controlling them may be a challenge tho'. I'd like to get a pair & investigate further.
