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Hey everyone its Erik from MAPerformance.com. Today we are going to show you how to install your new MAPerformance 3” Downpipes on your BMW 135 or 335i
We talked a bit about these already in the unbox video found here if you haven’t seen it already
Lets get to it!
We are going to start things off by saying we recommend you drop the subframe to get easier access to install these downpipes. However, we will be showing you how to from underneath for those with limited supplies and professional garage access.

Start things off by removing the under carriage tray

remove the 6 bolts from the front brace

pull the 4 bolts from where the downpipes meet the exhaust

remove the 2 bolts from the exhaust hanger

push the exhaust backwards carefully in order to release it from the downpipes

disconnect the rear oxygen sensors

be sure to remember not to swap the two sensors from bank 1 and bank 2 or vise versa, we recommend labeling them

The black shielded wire is bank one, or the front, and the grey one is bank two, or the rear

remove the oxygen sensor bracket

remove the two nuts off of the upper downpipe bracket
pull the two blue bolts out of the bell housing that hold the bracket

remove the bracket and reinstall the two bell housing bolts

next we will be getting the steering rack out of the way

remove the two bolts holding it in place

lightly slide the rack forwards and out of the way so that you have enough room for your hands

be sure not to pull too far or it could slide off of the steering joint

next we recommend you remove the heat shield above the rack. it is not necessary but will make things easier later

your should now be able to remove the old downpipes, competing the uninstall!
Moving on to the INSTALL

replace motor mount bracket bolt with supplied bolt, we included this to solve clearance issues

start by putting your old oxygen sensors into place on the new downpipes

guide the rear downpipe up into place into the upper v-band clamp. this is a little tricky so be patient!

once secured, tighten the clamp to secure it while you install the 2nd pipe

leave it loose enough to adjust once both downpipes are fitted

get the 2nd pipe into place and tighten slightly

adjust both pipes to make sure they are not rubbing on the motor or each other

next slide the steering rack back into place

replace the 2 bolts to secure it

connect the 2 oxygen sensors back in

they should only go in one way

there will be extra wiring left over, we recommend tucking it up and zip tying it secure so it does not rub

grab your supplied gaskets and hardware

attach the downpipes to the exhaust with the 4 supplied bolts and 2 gaskets

we had to drill out the holds on the old exhaust because of rust build up

tighten all the bolts!

replace the front brace! remember 6 bolts

put the belly pan back into place and you’re all done!

That wraps up this video on installing your brand new downpipes for your BMW 335 and 135i. Get out and enjoy them! But before you do be sure do drop this video a like. If you have some feedback or questions let us know below! Don’t forget to subscribe to our channel for many more installs, unboxings and tons more cool stuff.

High speed recording of dynamic tests on blind-bolted angle connections under direct tension. Peak strain rate: 20 s^-1 | Global deformation rate: 50 mm/s | Grade 10.9 M16 Hollo-bolt | Angle L75x100x8. References: – Málaga-Chuquitaype, C., Elghazouli, A.Y., & Radu, E. (2016). Contribution of secondary frames to the mitigation of collapse in steel buildings subjected to extreme loads. Structure and Infrastructure Engineering 12(1):45-60 https://dx.doi.org/10.1080/15732479.2014.994534
- Málaga-Chuquitaype, C., Elghazouli, A.Y., & Liu, Y. (2014). Response of blind-bolted connections under extreme dynamic actions. In 7th European Conference on Steel and Composite Structures, Naples, Italy