Definitely, but the Dinan boost controller makes very little difference and the app isn’t ready for prime time. The Burger Motorsports JB4 is probably what you’re looking for. It’s 4 plug and play connections vs 1 on the Dinan but it’s closer to full engine management vs the Dinan, which basically just under reports boost to the ECU, and the ECU increases boost to compensate.

I’ve had the Dinan Sportronic chip on both my C300 and my 430i, and the 430 now has the JB4. With the Dinan you’re never quite sure it’s doing anything other than making your wallet a little lighter. No such doubts with the JB4. It’ll scare the **** out of you the first time you let it off the chain.

http://www.burgertuning.com/mercedes_benz_W205_
C200_C250_C300_Stage1.html

Don’t waste your money on the jb4 for the c300

i just dropped over 750$ to buy a jb4 beta with the Bluetooth setup and it doesn’t make any more power than stock really

on the dyno it showed a 6hp increase over stock

even if it was 20-30hp you really can’t feel that much of a difference..the reason why it really doesn’t work (and this is probably the same for the Dinan piggyback) is that it just tricks the ecu into allowing a couple extra lbs of boost to sneak through ..but since the ecu isn’t aware of the boost I’m told that it will pull back the power/timing so it ends up not really making any more power ..I’m not sure of the exact details but Rob at AMR tried explaining it to me ..either way ..it doesn’t make any power ..so I just gave it away

the best bang for the buck is to have an ecu reprogram..not a piggyback

AMR makes handheld controllers that can get you an easy 40-50hp and for less money than the jb4

I ended up doing a big turbo upgrade (turbokits.com) with the armytrix valvetronic exhaust and Catless downpipe with an AEM meth injection kit ..all in that setup costs about 8-9k with tuning etc
but it still only gets you to 300hp at the wheels ..which is a lot better than the stock 190hp at the wheels stock

torque is almost double stock though so it pulls very hard ..still a ton of work to get to this point. This big turbo setup increases the boost from the 12-13lbs stock to a solid 25lbs

if you’re looking for power ..sell the c300 and a c450/43 and call it a day

just my $.02

I have a sprint booster on one of my other cars ..that’s all that does is decrease the peddle “lag” it makes the car feel more responsive but doesn’t increase power in any way

Damn, $750 and 6hp? I don't know if BMS would be around long if was selling horsepower at $125 per horse.

I’m guessing the OP isn’t up for bolt-on stuff and an ECU flash, just looking for a little more fun than stock.

On the BMW at least the JB4 is able to manage a f-ton of parameters. Here's a log file. I don't know what half that stuff means but clearly it's more than just a boost controller. On this run I think I was on Map 5 and running 40% E85.

I got a RaceChip Gts Black for sale. Selling it for 400$ it’s unopened

Sorry to hear about your experience, but this is not typical for our customers. We have hundreds of happy customers out there with our stage 1 and JB4 tuners on the C300 platform. I hope you sent our support staff datalogs to review so we could look them over before moving on.

For most customers on pump gas or mild ethanol mixtures the JB4 is the way to go as for about half the price of a flash handheld you get similar gains and the tuner is not VIN locked and can be resold later. For those of you looking to do turbo upgrades and beyond, the JB4 can still be used to do custom tuning over a flash map if necessary as well, plus all of the JB4's datalogging features, etc.

Not to mention kissing any warranty and the resale value goodbye with the ECU flash, turbo and catless downpipe. Did BMS sell Beta JB4s for $750 for the w205? Aren’t Betas usually given away as a way to field test?