Surge:He's talking about the turbine compressor's lack of ability to maintain consistent boost pressure, aftermarket compressor wheels in late 99 to 03 7.3 help this problem alot, if not totally remove the problem altogether. Banks has one for $99, others are about $75. As far as the power elbow, it won't do anything noticeable. And for the money I wouldn't change it. But the exhaust is top notch, thats why its a little pricey. I have the exhaust on my 99 and I'm totally satisfied.