I have fitted my KEAG system. But when I did up the exhaust flanges, they sit out about 3mm from the head on the engine, where as before they made contact. This is due to the exhaust pipe seats (the part that makes contact with the exhaust seals) being larger. will this affect exhaust gas escape? I have done the flanges up as tightly as possible, I am just worried that with a gap that big, it may cause it to leak.