How much more is the 135is? You can get a 2012 with the M sport package and add a power kit.
Power kit for 2012 1 Series 135i Coupe
BMW PERFORMANCE POWER KIT / $750.00
More horsepower; more torque and unlimited exhilaration. With sporty performance, outstanding driving dynamics and innovative technology, the Version 1 Power Kit maintains all of BMW's key attributes but allows you to put a personal touch on your BMW. The Performance-Optimized Engine Software provided by the Version 1 Power Kit increases torque to 332 lb-ft (automatic transmissions) or 317 lb-ft (manual transmissions) available from just 1,500 rpm. Power output is increased by 20 horsepower, from 300hp to 320hp. This results in faster acceleration from 0 to 60 mph (0.2 seconds faster than the standard model) and from 50 mph to 75 mph (0.5 seconds faster than the standard model). Even with this increased power, the fuel consumption and emissions ratings remain the same as they were with the standard model. The Version 1 Power Kit also adds a very sporty exhaust burbling noise during engine overrun conditions. BMW Power Kits are the only form of "tuning kits" approved and covered under the BMW of North America limited warranty. Power Kits are designed and tested by BMW engineers to provide the highest power increase without sacrificing reliability.
For vehicles equipped with option code S840.
I have a 2011 135i Convertible with the M sport option and purchased the power kit when it was first introduces and only paid $550.00 installed. I am really pleased with the results.
Last edited by JimS 135i X5d; 07-24-2012 at 03:29 PM.