I also have a 95 and was going to do this as soon as the weaher gets a little warmer. After it's all cleaned, how would one disable the EGR. There is a valve/throttle plate that closes and forces the engine to pull from the EGR. If you block the EGR you would just restrict the airflow to the engine. There is alot of info on the older engines but not the non turbo 603's.

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Karl B
95 E300 D
2006 Mazdaspeed 6
2001 GMC Yukon XL
1997 Contour SVT
Mazda RX-7 SCCA race car