First off the stock y is the biggest restriction from the manifolds back, so I would have a custom, mandrel bent one built, then do a single high flow cat and muffler of your choice with the o2 in the y pipe so its easy to get to.
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They do make the direct fit setup for tbi engines thoughWell his is a '94 so its a totally different setup and that would not work for him.
But a shop can build one and use a cat and that is legal?