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Originally Posted by cope05
Any thoughts?
Does anyone have another suggestion on replacing the mufflers only?
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Yes. Take a look at the resonator on your 1990 and you will change your mind about only the mufflers being restrictive.
Marc's article was about the '93+ exhaust, which has a much less necked-down resonator. I did sort of what you are talking about. I put an LT4 resonator on the car, and 3" Dynomax Ultraflow mufflers. I retained the stock tips for a stock look. The resonance is worse than stock, but better than some systems. And with someone else doing the work, it was 1/2 the price of the SS aftermarket systems cost.
If I were to do it over, I'd consider 2.5" mufflers instead, or possibly Super Turbo mufflers. The sound is great but the resonance is a bit strong.