ok, what causes the turbo to stall, is it a lack of air...too much air? I was talkin to the ol man about it and he seems to think that the 6637 is choking it off of air because when the hood is shut it covers most of that filter. I put my truck back to the stock setting and I could still get it to surge but not as much.

 

My 6637 filter doesn't touch the hood at all. If yours does, you need to reposition it a bit to get it to sit right. Besides, if the hood liner did touch, it's only a small portion of the actual filter and wouldn't cause it to "choke off". It's still going to flow way more than the stock box, and more than your engine will actually pull in.

The PSD is going to suck in as much air as it can. A stock intake is slightly restrictive, and prone to leaks. Add a chip or tuner and the stock intake becomes too restrictive at higher boost levels. This raises EGT's.

The turbo surge issue comes in with a chip or tuner. A power adder gives you more exhaust flow at lower rpm, spooling the turbo faster at lower rpm's. Also at that rpm range, an imbalance occurs with the stock turbo. More air is being supplied than the engine can take. The design of the wheel, compressor housing, and small turbine housing stalls out the stock turbo. Basically air is trying to back out the intake side of the turbo.

By putting your truck back to the stock tuner setting, you are reducing the power and exhaust flow at lower rpm's. It's much harder to get the turbo to surge, but having a 6-speed you have more control and ability to "force" it to surge.