I think the SC's have faired better in the rods because the power is not added so suddenly like with the TT but they had intial problems with burning through on pistons due to poor tuning and lean conditions, the TT's have snapped rods I think because of the sudden power that you get, I think that 6 pounds of boost is good and safe for daily driving as the power increase is not as big you get around 330, 8 pounds is good for occasional use and gets you around the 380 range but I wont use it regularly.