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03 Golf-occasional white smoke

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vmb:
Recently started seeing white smoke on occasion. Started out any time the car would coast in 5th gear after acceleration to about 3k RPM. Would just be a puff.
Kind of smells like brakes or clutch.
Just the other day, it bellowed white smoke for a bit until I pressed the clutch in while driving in a neighborhood.
Today, did the same for a few moments after stopping. Was doing about 40-50 in 5th, letting it sit less than 2k RPM and it smoked mayvbe for a few seconds at most.

Just shy off 200k miles on the car, though previous owner said the engine that is in it now is not the original.
Has malone stage 1, EGR delete and 2.5in straight pipe from turbo to back.

I haven't entirely been able to tell if it is coming from the exhaust or somewhere in the engine bay.
No signs of coolant in the oil or vice versa, and the smoke does not seem to smell like coolant, though earlier I thought I might have smelt some after a quick drive with the heat on.

Planning on changing the oil, oil filter, fuel filter and air filter this month.
Turbo actuator needs replaced at some point, I keep getting overboosts, though I don't think that has anything to do with this.

Any idea? So far my guess is something with the clutch, but...

I should note too that the timing belt had to be replaced due to the tensioner failing causing it to jump a couple teeth at the pump as well, though that caused a no start condition. Not sure if it could be related to this at all.

vmb:
Update
Got it to do it again and actually got out of the car to look.
Definitely coming from the exhaust
Smelt oily, I think. Had a bluish tint.

Checked the coolant, did not see anything out of the ordinary, other than it was a tad bit low.

Turbo or valve guides? I'll have to check the intercooler piping.

Could it also be the fuel pump dumping too much fuel into the engine? Too much fuel=white smoke, yes?

ORCoaster:
Too much fuel is black smoke.  Rolling Coal!  Or Dino Pee

White mixed with tint of blue with a smell not of diesel.  Hmmm.  Check valve guides and turbo for oil leaks that might be the blue tint.  Might be a bad injector too.

With engine running, place a solid bar, like a 1/2 inch long extension on the nut of each cylinder and put your ear to the top end.  All sound the same click and tick?  One particularly loud?  Pull it out, take it apart and clean the nozzle tip really well with a fine soft brass brush to get the carbon off of it.  Reassemble, with new or reformed heat shield and listen to it again.  More like the rest of them?

White smoke can be over advance as well.  Not sure where your timing is at.  IF it starts smoking again loosen the 4 bolts on the IP and push and pull on it and see if that changes it at all.

vmb:
I'll check the turbo as soon as I can.
I'll also give that a try with the wrench; hadn't thought of a potentially bad injector. Gets stuck open sometimes maybe?

As for timing, I would have to check with VCDS when I get the chance. The belt was replaced and the timing set correctly by the dealer last year around this time when that tensioner failed.
If I can think to, I'll try to get a video of it in the act.

vmb:
Tried the listening to injector trick.
Number 1 has a bit more of a "clink" sound than the others. I'll pull it and try to clean it. Also got some dieselpurge and a new fuel filter.

Others on tdiclub seemed to agree with the stuck injector diag. I should not that I've seen lower fuel economy lately and higher coolant temps. not outrageously high but higher than usual

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