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Originally Posted by Peaven
 Hey Bob, 22whp is very good for that mod....I've got the stock exhaust taking up space in my garage and have been thinking about doing the same thing...what combo did you use for muffler/resonators? |
I used an LT4 resonator and Dynomax Ultraflow 3" mufflers. There's a (abridged) write-up in the HoTB about it.
I initially wanted to use Magnaflow mufflers, I have a feeling they would be a little quieter. But the outlet spacing on them was too narrow to put the stock tips on, the tips would have been pretty much touching each other. The Dynomax mufflers had outlets with similar spacing as stock. Flowmaster 40's also had the right spacing, but those are baffled which I didn't want, and might have been even louder.
If you have LT1-style rectangular tips, then your options really open up. Those need a single outlet muffler, so you don't have any spacing issues or anything like us dual-outlet guys. Also if you have a '93 or later then the resonator should be about the same as an LT4 one, so no need to swap. But the '90-92 resonator was much narrower than the LT4 one.
They are a bit loud at cruise. I've gotten pretty used to it though. It's not headache inducing, but there is more drone than before.
I imagine 2.5" mufflers would work just fine and not cost much or any power. I just didn't want to put on 2.5" ones and then wonder... I figured if it's too loud, I could always have it redone with 2.5" ones. So far I haven't wanted to do that.