Mufflers, Anyone Run These?

[Flat Broke]

http://www.borla.com/products/product_multi_detail.aspx?cat=5&type=95

Before I pulled my 498 out of my old Spectra, I was looking into muffler options that wouldn't kill the performance of a fairly heavy breathing NA deal too badly. Fast forward a couple of years and I want to get my ducks in a row for when I drop the 498 into the new Spectra. Any input on how these guys work with NA deals? I want to take some of the edge off the noise (11:1 static compression) for my daughters.

Thanks in advance,
Chris

[Riverbound]

I havent used those but we have the gibson slip ons on our stoker and they quiet the motor down quite a bit with no performance loss. At times I take them off so I can hear the motor, but usually put them right back on because its so nice with them on.