How big are the stock tail pipes and how restrictive are they?

[The Deuce]

As long as they are not the smallest pipe in the exhaust, there is no restriction. If your collectors, mid pipe and mufflers are all bigger, go for it.

I would personally make sure the muffs are a flow-through, like magnaflow or ultraflow first, since a chamber is going to create backpressure worse than a .25 decrease in diamiter.