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Unfortunately there's not a lot of interest by tuners since the 550 and the 63, etc., already exist. There's very little market for V6 mods since the car is not sold to performance oriented buyers. Remember these are cars driven by a lot old people (at least here on the streets of LA where it's a very common and standard sedan.)
Also a concern with any mods for hp and torque would be the transmission. And the torque limiter will keep on keeping things mild.
Sprint booster will help with the sloppy and slow go-pedal. No performance improvement, but it helps psychologically.
I like my 2009 E350 a lot. But the reality is that it's not a performance car and never will be. The chassis has way too much body roll, the transmission is made primarily for comfort and mpg, and the steering is incredibly numb and over boosted. These are designed as comfortable cruising cars.
Instead of a pricey tune, headers, intake, etc., why not save up $$ for a garage queen weekend performance car instead. That's what I did. The money you sink for mods on a E350 won't give you enough of the "dollar spent for thrills returned" ratio.
Just my opinion.
ps., to the OP: I'd dump the 8000K and get the 4300K bulbs; they look more like the real OEM HID (which I have on my car.) The 8000K look way much too Ricer, imho.
I have an E500 and I gapped the hell out of an E350 it wasn't even close, you will have to do some crazy things to keep up with E500.
I highly recommend putting all your focus on the exhaust, it's so restrictive you can literally unlock close to 30hp out of just removing secondary cats, mufflers, new x-pipe, and better headers, and high flow main cats. Add a tune on top of that and you've added 55hp and 60tq. A bit of weight reduction here and there, AEM air filters. Liquimoly oil. You're good to go.
I used a Kess V2 to extract a copy of my ECU then paid a professional tuner to tune it basically max stock. Which for my E320 CDI I6 3.2 was a 200 hp and 370 trq stock pushed it up to 250 hp ish 450 trq ish, I think you can go more but I like not broken stock stuff. That in all was under $300. Not sure how much power boost you would get on a gas 3.5. You could research a route like that. All I know is that a lot of tuners are cheaper when you already have the file so you can just find a reliable place then email back and forth.
I also just realized after posting the original post was from 2007 then in 2009, this is a little late.
No bugs, still runs absolutely amazing. The new Kess V2 out now does even more vehicles, and suppose to be faster. Honestly the hardest part is finding a someone who was willing to tune for me without trying to sell me there own tuner / obd device. Had a couple companies turn me down, just striaght up no when I tired to buy just the tune.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
Jun 5, 2015, 06:24 PM
(at least here on the streets of LA where it's a very common and standard sedan.)
