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Originally Posted by Aurora40
Yeah, the '90-92 certainly has a worse resonator than the later ones. On the cat-back Flowmaster system, though, is it that much worse than that resonator? If you'd used the cat-back resonator unmodified, isn't the inlet like a single 3" or smaller? Not that different than the dual ~2" pipes through the stock resonator, especially as those are straight-through.
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The Flowmaster catback uses 2.5" pipe and stock is 2.75, however, the decrease in restriction with the Flowmaster cat-back makes using it a net gain.
The Flowmaster resonator, is single in and two out. We modified it to accept a larger inlet.
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Originally Posted by Aurora40
I'm making an assumption, and it may not be the right one. I figured if someone was going for the Flowmaster system, they probably wanted a good sound and a good price, not necessarily the most HP increase. Which is why I suggested doing just the mufflers. It would probably be a fair bit cheaper, especially if you would have paid a shop to install the cat-back system. And I suspect it would have that Flowmaster sound, and be fairly similar in the power change.
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If you were willing to accept less or, perhaps even no performance gain and just the improvement in sound, I agree--going to Flowmaster mufflers but not the full catback might be the way to go.
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Originally Posted by Aurora40
The muffler-inlet restriction shouldn't be an issue. The pipe could be cut past the taper, and/or flared out to whatever the diameter of the replacement muffler is. I think the 40 and 50 series can be had in 2.5 or 3" diameters in a case similar in size to stock.
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Interior resonance might be an issue with 40s. The 50-Series Delta-Flow unit would be the best to use in that sitch.