valmont

sounds like a fuse with a bad connection.

I have a few mods that make fuel economy better: muffler delete and cotton air filter, and I'm getting 31mpg average, 37mpg+ on motorway at 75mph. It's the easier car I've ever seen to change oil and filter on. Bushings wear out quickly: know problem, but replaceable. Gearbox is a bit dated having only 5 gears, but is one of the most reliable out there. I added sound deadening to the floor of the passenger and driver side and it now drives like a 7 series on the motorway (sides and roof insulation was already good). Rear seat comfort and space really sets it apart. I heard the Superb is great for this too. The boot is 620 liters, bigger than many SUVs. The shock absorbers are too stiff. But otherwise reliability and bang for your buck is incredible. I still love the way it looks more than anything else and I get complimented on it after washes TO THIS DAY, 10 years after I bought it. You do lots of miles: EGR delete (essential in any diesel) and chip tune for economy, and drills a few holes in the lower center of the rear bumper will allow you to motorway 40+mpg at 70+mph. Otherwise you need to be doing 60mph on a normal 300CRD to get those numbers.

I have a performance K&N filter replace my OEM one. The difference is instantly noticeable in terms of response. If you see the design of the OEM, you don't need to get expensive K&N to improve on the flow..... Don't get a cone filter since that will just get dirty quickly and reduce power/economy by sucking in hot air. Many good chinese cotton filters for 1/2 price of K&N ones.

They normally just made a richer fuel/air mixture, potentially lowering mpg, but giving much better response torque. But the richer mixture will create more soot, which will get put back into the intake clogging up valves and swirl motors quicker. If you want the response and torque benefits lower down in the rev range, and not spends tons on parts destroyed by soot: you need to chip-tune delete the EGR. So, I don't see the point in it if you're going to re-map the egr already you can re map the rest for not much more money.