335xi Performance Bang for the Buck - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-18-2013, 08:39 AM
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335xi Performance Bang for the Buck

I just purchased a 2008 335xi coupe with a 6-speed manual. I'm interested in boosting the power but am not interested in throwing money at mods with little impact....don't tell me to buy a CAI.

I did a little looking around and it looks like the following might be a good start. Am i off path or is this a good place to start?

JB4 PNP (N54 Stage 3) plus BMS USB Cable combo
$509

BMS WW Quick Install Meth Kit w/ JB4 FSB Integration
$479

BMS 135i 335i 3" Performance Downpipes
$379

prices are from burgertuning

Do the BMS downpipes fit an 335xi or just the 335i? If I take the cat out of the down pipe, can i tune out the downstream o2 with the JB4 PNP? I'm not going to buy 50/50 meth/water. Is a meth kit worth it if i only run -30 degree F washer fluid? The info for the JB4 said it will automatically update the air/fuel for e85. Can you run e85 without going to higher flow injectors and fuel pump? how does the JB4 know what % of alcohol is in the fuel?....at wot is the air/fuel set by fixed table, automatically adjust based on a OEM o2 a wide band or are tables adjusted automatically based on air/fuel trim at low throttle?

I don't know anything about BMW's so any other suggestions would be appreciated.
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#2 (permalink) Old 05-21-2013, 02:45 PM
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Welcome to Bimmerwerkz.

While I dont own an E90, i do know several people that do, and the JB4 is excellent. Other option would be a Cobb program.

With the down pipes are you replacing the stock exhaust as well? Because the downpipes are great but you will get restrictions when it flows into the stock muffler.


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