I had to cut the wastegate arms, shorten them but about 1/4", tap them, and use a lengthened bolt. Definitely T the lines and test to make sure they open at the same time. I set mine at 9 psi. Honestly I probably wouldn't do it again, I bought a new greddy profec EBC at the same time and I still had the same ill effects. It was all in the EBC tuning and setup that fixed it for me.