Not necessarily. Here's an interesting article, http://www.hotrod.com/how-to/engine/hrdp-1011-cams-for-turbocharged-engines/, that talks about how cam timing and back pressure can effect each other. I don't know enough about the VVT in the EBM engine to say that that is the case here, but Adam's post hints at it. I'm hoping he'll jump in here with more info. I'm interested in this because it might help me decide whether or not I eventually get a downpipe and/or an aftermarket exhaust, and what kinds to get if I do.
Ah, OK. I thought you were talking about all turbocharged cars. What I'm taking away from this discussion is that exhaust systems are more complex than I thought, and that there's a tighter coupling between engine design and exhaust design than I thought as well. Does anyone know if the VVT is controlled by the ECM? Can a tuner adjust the cam phasing? I always thought that for forced induction, the more open and free-flowing the exhaust was the better. Now I'm not so sure. I'm definitely going to need proof now from downpipe and exhaust manufacturers that their products work before I purchase; not only work with the engine, but also work with other exhaust components.
