Tests show about a 3 - 4 HP gain with the Moroso kit. It sounds great at WOT and I felt a sharper throttle response but the actual power gain is rather tiny.
I recommend this mod for Mustangs that don't intend to see many serious mods, such as heads, cam and intake. If you just want to clean up the engine compartment and get a few HP, it's fine. If you're saving up for new heads, don't bother with it. $100. is a lot for what you get, but I'm pleased with the kit on my '90. Fits well, looks good and I'll take the 4 hp, thanks.
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