Y-pipe
But that's besides the point, because without headers there's no reason to change your cats OR ypipe, not worth it. Save up for headers and then 1). run true duals, (recommended) or 2). get the ypipe that goes with your headers.
At that point it would be a good idea to replace your cats too.
Alot of the newer and better made high flow cats won't lose you any power, keep you smog legal and not smell. A good deal of people also enjoy cats for the tone they give and few DBs it quites the car.
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The SLP Y pipe does not provide any real performance gains, but it does make the car slightly louder. I bought mine used for $50 and put it on with my hooker carback, and it was a small, yet noticeable improvement in sound. Is that small improvement in sound worth the $200 price tag of a new SLP Y pipe? I doubt it.
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The majority of users here run one of the those two types, some recently run the ebay stainless headers (See the ebay warning thread sticky).
The performance of all of these headers is about the same performance, the huge difference in price you will see if because of what material they are made out of (stainless steel or coated).






