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Originally Posted by Hib Halverson
That's a legitimate complaint and I apologize for that shortcoming.
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Heheh, no problem. The article is still great. It's just there are like 10 pictures of the back half of the system, and man I really wanted to see how the resonator fit up.
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Originally Posted by Hib Halverson
I'd think twice about simply cutting off your stock mufflers and putting replacement Flowmasters in their places. No doubt the exhaust will sound better, but you won't see as much performance gain, especially on 90-91s. All ZR-1s have pipe restrictions at the resonator and at the muffler inlets. These restrictions are eliminated when you put on the entire Flowmaster catback rather than just mufflers.
Converting from stock to a Flowmaster cat-back on a stock or near-stock ZR-1 gains between 8 and 12 hp.
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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.
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.
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.