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Nothing like a few phone calls. Even tech support at MagnaFlow was a little unsure without digging into their drawings. But I think the 16606 is routed a little different, placing the muffler in a different location. The 16679 is specifically made for the ST due to being mounted under the bed...

Ok. I did some digging on MagnaFlow's site. They post a 10/10 power gain. Looks good. But they refer to two different catback systems for the '07 ST with two different part #s: 16606 and 16679. What's the dif? tracstar

Yeah, it does sound great, but what about performance? I'm all for making a vehicle sound good as well as look good. And I'll be the first to admit, the 4.6 V8 is one of the best sounding engines on the market today with the right tune. But I hesitate to spend $400 on a setup just to make it...

The weekend after the 4th works for me, Sat anytime or Sun after church. I take delivery of my '07 ST on the 3rd. :D Provided the train doesn't derail or something. Even if I don't have the truck yet, I'll still probably be there. John