hi Poralese
Yes you should keep your Merc!! Trust me when I say this, Mercedes quality is WAY better than any Proton! I wanted to sell mine until I realised it's performance potential which many people never knew.
1. If you care about fuel consumption, rebuild the engine. They really last!! But 1.8 is a tad underpowered. But if you do not care about that then you could swap it for a 2litre, 2.3, 2.3-16v, 2.5-16v or a 2.6. The most powerful is the 2.5-16v. And yes the 16v engines are fuel injection but not electronic. It's mechanical. I have heard people swapping the engine for newer engines like the C class engines but you need to have a half cut and no such thing as just the engine. Will be one major headache to the mechanic. There have been people who have turbocharged the normal 2 litre engines. It works well for them but you need it to be custom built by a pro.
2. Interior, the 2.3-16v and 2.5-16v have similar interior to the Evos. There's no way you can get an Evo interior. Not available since it's a limited edition car. You can get them at halfcut shops specialising in Mercs.
3. I use H & R springs those are pretty good since I've got a friend using them as well with Bilstein absorbers.
Hi Chriiz18,
Are you selling the transmission? What's wrong with your engine? From the pic it looks like it says 2.5 tho.