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Well I dont have a how to but I can tell you what NOT to do!!! There are a few places that have VERY THIN walls and if you take too much material off, you will break into a void. I fixed it with some JB Weld and it will never effect of hurt anything but it is just one of those things that you live and learn!
I think it is worth it. Anything that help airflow into the engine is worth it. There are areas on the TB opening that, if you remove material, it will help air flow!