I have a close friend who has won the SARRC championship 2 years in a row in his mustang and he runs the 8.8 with no problem and 400hp at the flywheel. His t-5 is what has given him fits in the past. We have the 7.5 in our car and I know the power is much less but we have never had a rear end failure in 5 years. In fact in 5 years we have always finished every race, unless we hit a wall! 2 new front clips in back to back races in 2004, that was a fun year!