Compression Ignition Addict
Join Date: Dec 2011
Location: Altoona, Ia
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This has been covered many times over in the last year or so but I'll give you some answers.
The factory pyros that are in the exhaust now are disabled when the PCM gets programmed with delete tunes.
Monitoring EGT that far downstream of the turbo is a waste of time. The numbers are WORTHLESS and have no meaning really. Pre-turbo EGTs are the only ones that count for anything, period.
You don't have to fully delete the EGR to be able to monitor EGTs properly. Obviously you're deleting the emissions equipment which disables the EGR when the PCM gets programmed. A $40 set of block-off plates from H&S is all you need to get real EGT numbers that will mean something. Not sure why anyone running delete tunes wouldn't do this....
Another thing, your exhaust will be DP back, not turbo back. The OEM double walled 4" DP works just fine.