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You could get it anodized black, that wont hurt efficiency. Using paint to put a thin layer on the intercooler will cause a slight decrease in efficiency but it would be negligible. Thick layers over the intercooler, like powder coating, are a no no, as it will insulate them.

It's not just the 350 engine, it's the whole GR family of engines. I've been seeing a lot more problems with the 250 and 300, but that could just be because we sell more of those than the 350. On to the problems. All of them are blowing a good deal of oil back into the intake, so much that...

While the IS350 is pretty potent, you don't want that engine. It has its fair share of problems that are starting to pop up.

Not the best pictures, but you get the idea.

Final Gear For all your Top gear needs

I'd say turbo seals or valve stem seals. Under deceleration you pull more vacuum than under acceleration which if the valve stems are old and or worn out could cause them to leak. And the smoke would be blue if it goes through the combustion chamber, if its going straight to the exhaust it would...

IIRC the exhaust is a few inches to long, so you need a shorter test pipe to get it to sit right.