I had the same problem 08 2.2...stock cast header cracked down center leaking exhaust..figured go with stainless..after install was leaking antifreeze. ..2 center pipes were pushing on coolant tube below...easy fix.. I just removed it an got out my sledge hammer tapped flat spot on the 2 center tubes. about Quarter to half inch......reinstalled no more leak....I didn't use heat or torch.. no welds were harmed... but I would recommend heating before tapping..