yeah Smoke its not bad at all took me about 20 mins to drill and tap. I did it just like Marc explained that simple. I can tell you this I had my pyro post turbo 1st then switched it to pre turbo after hearing a dozen or more stories of cracked and melted pistons. Its amazing how responsive it is now its moves like a tach does where as before it was very slow and I never saw over 800 degrees post turbo pulling now I can hit 1100 up a hill pulling pretty easy but is pretty easy to control with the throttle just back off till its stays put. I would be VERY conservative with egt #'s if you run it post turbo. Thats my experience. Later Tim