do me a favor and take it back in a day or and ask to have a retorque just to ensure the bolt isn't backing out.
after you tune and replace the pump you might consider a n/w supercooler. the 181 is going to generate a large amount of heat and the least you will need an e55 h/e or bigger. it will help keep things cool. also look at the wavetrac thread. you can get on a standby list . it will be the last diff you will have to install.