[quote=Aurora40]That Hib article is about a custom system. It looks like he only used the resonator from the Flowmaster cat-back system. One thing I found frustrating about his article was all the custom work done to fit that resonator into the LT4 system, yet there isn't a single picture that shows it!
(snip)
That's a legitimate complaint and I apologize for that shortcoming. The web-based version of that article was based in-part on an earlier print version of the story and there were some diffculties during the creation of the web version such that some pictures were lost.
I should add that adding the Flowmaster resonator to the stock LT5 head pipes then adding the LT4 rear section to that, while a time consuming job, is a task that any exhaust fabricator should be able to handle....an everyday, low-cost "muffler shop", maybe not...but a facility which has good welding skills and equipment and does high-end exhaust work should be able to handle it.
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Originally Posted by Aurora40
Also, FWIW, if you were going to have a shop install it, you could probably just have a shop replace your mufflers with Flowmaster mufflers. If you had a '93-95 then it would probably have a similar or better gain, plus you could keep the stock look with the rectangle tip. But if you want to do it yourself or you want to keep the stock system in-tact, or whatever, the Flowmaster is certainly a low-cost cat-back way to go.
I seem to recall reading on the listserv archives about the resonator not being very ideal inside, though I can't recall exactly.
Flowmaster generally has a very nice sound, though.  |
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.