Is it common for a catless car to produce white smoke out the exhaust at idle? Or wot

 

No, that makes no difference I won't even admit how long I've had cat less cars for........ (environmental frownie face)

 

What if it has gsc s2 cams/ bushur tbe exhaust and without a tune. System rich code.

 

Same here. I've had countless cars without cats and that has never caused white smoke. Sounds like you have an issue other than that.

 

If the exhaust is brand new and just put on you will experience smoke. If you are running rich you will experience black smoke. The most common cause of white smoke is burning coolant. Check around the bottom of the head to see if its leaking. GSC S2 cams with the boost turned up without ARP head bolts could have caused the head to float, in return causing burning coolant.

 

Sound like a headgasket to you? Theres no coolant in my oil or vice versa

 

My Mustang and Evo are catless and no white smoke whatsoever, it smells awful when they're idling in my garage though!

 

Either that or your burning a little bit of oil. How many pounds are you running? Did you upgrade the valve springs when you put in the S2 cams?

 

Is it white/grayish ?

 

Brian crower valve springs and retainers. Im hoping its nothing serious. I bought the car already modded.

 

I would say so, yes

 

Your burning coolant!

 

Definitely coolant from the sounds of it. Is it a constant smoke at cold start and operating temp?

 

Its prolly starting to leak, do a leakdown test that should tell you right away. If its a headgasket(bubbles on reservoir/radiator) get an OEM and Arp head studs. Dont wait too long!