I have a '53 plate bora with 155,000 on the clock. I'm having problems with egr valve (keeps going into limp mode, with code p1557) I've changed the n75 valve, the MAP sensor and cleaned out the egr, but the problem is still occuring, I'm thinking of getting a delete kit to replace the egr, but before I do I was just curious as to weather it could be detrimental to my engine??