hi. this is my 3rd mercedes diseal, first was 82 300sd and second 85 300d now i own a 1987 300d and having used the 617 engine for a few years i was very happy with the performance difference. altho by diesel standards 150hp is a rocket i would like to increase performance. i have been hearing bout the alda adjust and egr valve removel which i have been using on my 617's but is there anything else that could be done to get this puppy over 200hp? i feel the engine has alot of potential and the w124 has proven itself to be a great chassis in my eyes. some ideas i have heard are propane injection and intercooler. if anybody has good knowledge of this engine and can telle me any expensive or inexpensive ways to boost performance im all ears. i have access to a mercedes shop and 2 mechanics with over 30 years of mb experience. i know your thinking ask them what you can do but they fix the cars by the book and i understand why they dont give me this advice but regsrdless they will help me if i need them. thanx alot.