Ok, I've been wondering this for a while now. Are parts, mainly the engine and exahust (down to the cat) mods interchangeable for 95 E36's and 95 E34's? Ok, I'll clarify even further, I'm talking about the 325i and 525i. They both use the same M50 engine. I was wondering if it would work if I buy a cold air intake that they sell for the 325i. I was also wondering if the track pipe that they make for the 325i would work on the 525i. I've been looking for a long time for either a track pipe or high flow cat for my 525i and can't seem to get any response from anybody. If anyone has answers or suggestions please let me know. Thank you all for your time and have a great day!