BMS BMW N54 JB+ (1M, 135i, 335i & Z4)
A true plug and play tune offering safe and adjustable
25-40 Horsepower gains at the wheels!
At the default setting of +3psi average increases are 30hp and 40tq to the wheels. For those looking to take things to the max up to +4psi can be quickly dialed in! Does not trigger codes and does not require entering the ECU area for installation. Can be installed and removed in minutes without any tools. Compatible with all ECU versions and transmissions for the 2006-2010 BMW 335i, 335xi, 135i, 535i, Z4 and Z6 N54 Twin Turbo. Also compatible with 2011-2012 N54 335is models.
To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.
BMW 1 Series
• 2008-2010 E82 Coupe 135i
• 2008-2010 E88 Convertible 135i
• 2011+ E82 1M
BMW 3 Series
• 2006-2010 E90 Saloon 335i / 335xi
• 2006-2010 E91 Touring 335i / 335xi
• 2006-2010 E92 Coupe 335i / 335xi
• 2007-2010 E93 Convertible 335i / 335xi
• 2011-2013 E92 335is
BMW 5 Series
• 2008-2010 E60 Saloon 535i / 535 xi
• 2008-2010 E61 Touring 535i / 535 xi
BMW X Series
• 2008-2010 BMW X6 xDrive35i
BMW Z Series
• 2009+ BMW Z4 sDrive35i
Free Next Day UK Delivery
Receive it the next working day if ordered before 11am! We can also ship worldwide, simply contact us for a quote.
5 Year BMS Repair Warranty
JB+ Dyno results (Click to enlarge)
JB+ only dyno testing on a 335i with 91 and 93 octane pump gas
Excellent plug and play upgrade
Easy to fit and worthwhile noticeable gains. Just what I wanted. I chose this product over a remap because when the times comes to sell the car I can remove the JB+ and sell it seperately thus recouping most of my purchase price. Excellent service from Marshall too. Would recommend.
No Pain Mo' Gain
Before I reviewed the JB+ I wanted to make sure I'd been running it for a couple of months to ensure I was giving it a fair write up. Installation is really as simple as is described, I faffed about taking pictures (for my blog) and it still only took 20mins start to finish. Make sure you use the USB trick though, works a treat. I set my JB+ to 3 o'clock position, which is just under full +4psi (which is how it shipped, although it's supposed to come at 12 o'clock position +3psi). To give the car time to learn the new adaptations (fuel/air mix etc) I drove it for about 30mins very steady. Driving steady is supposedly best as this is when the car does it's learning, not at full chat. The car didn't feel much different, so I was a bit nervous I'd wasted my money for minimal gains. However, after 30mins I could wait no more, I gave it a blip and instantly felt the difference. I was genuinely shocked how much difference it had made, the car had come alive. It gives you a kick in the back when you floor it, over taking was never a problem, but it really isn't now. I couldn't recommend it more highly, I know you can get more gains from a JB4, but for the price and ease of fitment, it's great value for money. It hasn't appeared to affect my mpg either, result.