I just got a titan downpipe and HKS titanium exhaust system installed, and now when i start up the car a puff of blue smoke comes out the back. Is this normal because there are no more cats? Let me know what you gusy think, thanks.

if i remember correctly blue smokes means that your turbo has shaft play? not too sure mine does that too

I dont think it means theres shaft play. I picked the car up completely stock. With the stock exhaust, there was no smoke on start up. This only started happening when i put on the exhaust and downpipe. I thought this was a normal thing with no cats.

valve stem seals. very common issue, most cars with 80k+ have the same problem. if you are really worried about it then spend the 600-1200 to fix it.

Thanks Supras_own_u, ya my car has almost 87K miles on it. I feel a lot better now knowing that its a normal thing. Does it matter if i change them or not? It doesnt bother me, i just want to know if its bad for the engine or turbos if i dont change it?

nope wont hurt anything, just make sure you keep an eye on your oil level.