Get new gaskets. Save you getting a vacuum leak. I didnt replace mine when i installed a 65mm and the car ran like crap so i took it off thinking it was the TB. A few weeks later I bought some new gaskets and reinstalled it and holy ****. Big difference. Vacuum leaks can be pesky no matter how big they are. Save your self the headache and get the $5 gaskets. Alot of people over look them.