Having finally purchased an after-market performance chip I wanted to be able to easily switch back to the original chip to make comparisons and perhaps even in case of unavailability of high octane fuel.
When I first bought my 1991 325i I knew that, being a very early E36 model, it had different front suspension than the later models, and because I thought this must be inferior to the later models I intended to change to the later type.
There is already a lot of information online about the problems with M52 and M60 engines due to the aluminium block and Nikasil cylinder bore lining used in most countries where these engines were sold.
If you have a BMW 3 series or Z3 with a Downing Atlanta supercharger kit fitted (DASC), at some point you are going to need to replace some parts. I have been researching what the replacement parts are.