Just bought myself a E36 325i, im quite new to this side of the world as i previously owned japs which were very simple when it came to increasing power. I'd like to just quicken mine up just a little, its got just a scorpion backbox and kn filter. De-cat usually does some magic but im starting to think its not possible to just get a De-cat replacement pipe, rather you have to buy the complete exhaust system as ive looked everywhere.
Also were the 325i restricted in any way like the 328's were with the exhaust manifolds?
Finally what sort of power gains would i be expecting with breathing mods and a remap?