In the search function I find unfortunately not (for me) usable on the topic. Maybe I’m just too stupid to look for the right one, but let’s keep this for ourselves The cleavages that can be done on the old diesel engines with distribution pump (especially VAG) are largely known to me. However, with my 2.0 hdi 90 I don’t really know what I can do. Maybe I should have learned a technical profession Kat is processed and replaces end pot against a pipe zt. I have to honestly say that the little one now responds noticeably better. Sports air filter (of course no open one) doesn’t really bring what in my experience, since the turbo sucks in enough air anyway? For a retrofitted charge air cooler you would have to change something about the injection so that it really does bring something (or do I have a thinking error ) Are there any other ways to tickle out a bit without going on the electronics? I am not talking about the hdi in particular, but about common rail systems in general. Let’s leave the legal foundations to the left, you don’t necessarily have to take part in public road traffic, sorry if that was a little bit of a text, but maybe there is someone who is interested in the topic just as much as I am. LG