Originally Posted by Sticky
Its gonna be a long ways off before any other N55 upgrades hit the market, all of the ones on the horizon get rid of everything, and bolt on completely new manifolds, turbos, piping, etc, etc, etc. Meaning if you have any warranty left, keep your car away from the dealer as one look down there and its most likely voided. We went the hybrid approach because it leaves warranties intact, and has the potential for good power gains, can it match the power potential of a full bolt on system, it cannot. But they will be more expensive, invasive, and 90% of people are happy with 500 / 550 street cars.
The wait for the other kits may let tuning catch up, which would be a good thing, as trying to tune a stage 3 style system without a flash, back end or complete tune would be pointless. "