I run straight pipe full-time with only the flex turndown tube after the turbo. Yes, it's loud compared to normal.

Since I have to leave around 6:30am for my work now, I have put everything back on before the locals around here start ot "complain." They tend to voice their opinions by stealing my tire valve caps, adjusting my mirrors, and turning my star (Now that's going too far!).

I have noticed quite alot more turbo lag and overall stuffieness around town.