Exhaust smell and white smoke

[SacE30]

I changed the CAT. And put a m3 muffler on my 325i And it stoped smelling a smoking for 3 weeks or so. And now the same smell and white smoke is back?!?What else can I do for it to stop?

[87e30]

ls1

[MikeDE]

What does it smell like?? White 'smoke' is most likely coolant, and dissipates quickly. HEAVY oil burning(like when someone puts Diesel in a gas engine) is white, but it stinks like oil and hangs around quite a while.

Does your car consume coolant??

[Danny]

Stop driving it.

[SacE30]

Well I did a royal purple oil change and change the CAT and put coolant over a month ago. But where I put the coolant , I opened it today and it was still full?

[krooks]

blown headgasket

[SacE30]

But the smoke will go away after 5 mins. But when I start my e30 it get really hot quick.

[DREWHALL]

Sounds like you've got a leak somewhere. When the head on my M20 cracked it started slow like you're saying.

[quikveedb2]

blown headgasket

[Koen]

^ That