I am a little off topic, yet still within bounds I think. As for EGR, as my profile picture shows, I have an 85 Laser which I have installed my own combination of stock Chrysler parts. It has a 2.2L 'Common Block' with a 2.5L crank and pistons meant for a 'non-turbo' 2.5L engine. I run the 2.2L two piece (2) intake manifold and use the Mitsubishi turbo. The whole thing is intercooled using hardware from the Chrysler TC by Maserati cars. Power is pushed through a Getrag 5 speed manual transaxle also from the TCs. IT DOES NOT HAVE EGR. Boost can be controlled either by the original means or manually which is the way I keep it generally. This setup is especially strong on torque right off the line. Boost is manually held at 3-5 lb. It really doesn't need more for my type of driving. This is NOT a race car and is used as a daily driver delivering up to 34 MPG on a combination freeway / highway / city run of 313 miles from my home in AZ to my business in Ventura, CA. As to the question of pinging, I have never heard a single 'ping' and have been driving this car as described for many years and many tens of thousand miles.