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I don't really know how restrictive each one is for the exhaust, but I would think the stock precats would be more restrictive then a resonator. A benefit to using resonators is they will not break up in time and maybe end up clogging the main cat like the precats might do. As far as the tips go I've heard they are kind of restrictive to, but unless your planning on building your motor or your going to turbo your car I wouldn't really worry about it. In which case you would probably want a whole new exhaust anyways. I just kept them because they look so good on the car. I searched for awhile and couldn't find a single tip I liked as much as the stock ones.
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