Category Archives: Modifications

BMW N54 FMIC Upgrade: VRSF 7.5″ Race Intercooler

After installing my new fuel system and turning up the boost on my MMP Stage 3 turbos, I started to notice some really bad heat soak in my logs. Guessing that the car is around 600-650whp at 28PSI, I could see that my standard VRSF 7″ Street intercooler was no longer keeping up. It did a great job on my stock turbos, but I needed something a little bigger.

After doing some research, I found the VRSF 7.5″ Race intercooler. Judging by its size and efficiency ratings, it seemed like the perfect intercooler for my power goal of 700whp. I ordered it right away to help cool things down a bit. Four days later it showed up, very nicely packaged.

Continue reading BMW N54 FMIC Upgrade: VRSF 7.5″ Race Intercooler

BMW N54 Fuel Upgrade: Precision Raceworks Fuel Pump & Port Injection Kit

After installing MMP Stage 3 turbos on my BMW 135i, I needed an upgraded fuel system to get the most power out of the car. I was filling up with an E40 mix of 93 and E85 , but my HPFP couldn’t keep up and my old stage 1 inline LPFP was inadequate. I needed something that could handle straight E85 fuel and not run out of pressure at 700+whp.

Having good experiences with Robert at Precision Raceworks, I decided to go with his Stage 3+ Modular Fuel Pump Kit and opted for the upgraded fuel feed line and PNP harness. This would take care of my LPFP issues. I also purchased the PR/MMP Port Injection Kit at the same time to help my HPFP.

The products arrived quickly and were packaged nicely. I’ve always been satisfied with the quality from Precision Raceworks for the price. Upgraded fuel feed line not pictured.

Precision Raceworks Stage 3+ Fuel Pump and Port Injection Kit

The first step was to install the upgraded Stage 3+ bucket that had two Walbro 450s stuffed inside. Robert was nice enough to assemble the fuel pumps in a core bucket for me to swap out. Usually you have to modify your stock bucket while mounting and wiring up the pump yourself. I jumped in the back seat and got to work.

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BMW N54 Turbo Upgrade: MMP Stage 3 Turbos

1/26/18 UPDATE: I ran the MMP turbos at 30psi for about 500 miles and then my motor dropped compression on cylinder #3. I don’t think this was a fault of the MMP turbos. After removing the motor and turbos, I decided to convert to a single turbo setup for various reasons. Watch this video for the full scoop.


On a constant quest for more power, I found myself looking to upgrade from my stock turbos. There are a few different options available, and even some single turbo conversion kits. After doing some research, I was set on a pair of MMP Stage 3 turbos. They offer 700whp capability with OEM fitment and come at a great price. After hearing praises about Mauricio’s customer service at MMP, I decided it was a no-brainer and pulled the trigger!

I opted for fully-optioned MMP Stage 3 turbos which included a 2 year turbo warranty with the bearing treatment. These turbos require larger inlets and outlets, so I opted for MMP’s silicone outlets and aluminum relocation inlets since I already relocated things for aftermarket inlets on my stock turbos. I also ordered the turbo install kit because I wanted fresh o-rings, gaskets, etc.

After reading some DIY N54 turbo install guides, I decided to tackle the job in my garage on jack stands. This would be one of the most involved projects I’ve ever attempted on my own, but I knew it was possible.

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BMW N54 Clutch Upgrade: SPEC Stage 3+ with MFactory SMFW

If you’ve been following my website, you probably read my detailed post about installing a 335is/550i clutch after my OEM clutch wore out. However, with MMP Stage 3 turbos on the way, I knew the 335is clutch wouldn’t hold as I turned up the boost. With a goal of 700whp, I decided to replace it with a SPEC Stage 3+ clutch and retain my MFactory single mass flywheel.

SPEC Stage 3+ Clutch

Since I just installed an MFactory SMFW about 20k miles ago, I decided to reuse it because I knew it was in good condition.  All I had to do was purchase a SPEC Stage 3+ clutch with OEM or MFactory flywheel configuration so it would mate up properly. If I didn’t already have the MFactory flywheel, I probably would’ve bought a SPEC flywheel to go with the clutch. However, I’d rather save some money when possible!

Since the transmission was going to be removed, I wanted to refresh a few things at the same time. I noticed my shifter developed some side-to-side slop so I decided to upgrade the bushings. The car has almost 120k miles and still has the OEM transmission mounts, so I knew those could be replaced. I’ve also never servied the rear differential and noticed it was seeping a tiny bit of fluid. Might as well replace the rear pinion seal and flush/refill the fluid!

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BMW 135i – 335is/550i Clutch Upgrade

2017 Update: This 335is/550i clutch setup held up great for 22k hard miles! I have absolutely no complaints. In June I decided to upgrade to MMP Stage 3 turbos and chase 700whp. I knew this clutch setup wouldn’t hold, so I removed it and replaced it with a SPEC Stage 3+ unit.


After adding my aggressive E85 flash last summer, the factory clutch started to slip. I decided it was time to upgrade so I could enjoy the car to it’s full potential this summer. From Spec to ACT, there are plenty of aftermarket options available. Then I found the 335is/550i clutch upgrade on ECSTuning, so I started to do some research.

This clutch comes factory in the F10 550i, which puts down 443 tq and weighs a whopping 4552 lbs. DINAN doesn’t offer a clutch upgrade for their different stages of 550i’s, so apparently they feel that it is adequate. Their Stage 3 550i puts down 580 tq and they kept the factory clutch. Also, someone on the forums is using this clutch and claims that it is holding at over 620wtq on aftermarket turbos. To me, it sounds like the clutch is severely underrated.

My 135i won’t see more than 500 tq anytime soon. I’d guess that it is currently around 420whp/465wtq, but only weighs 3300 lbs!

I decided to give it a try. Here is my parts list from ECSTuning:
Continue reading BMW 135i – 335is/550i Clutch Upgrade

BMW 135i – Stock Turbo N54 FBO Dyno Results

After enjoying the car for a few months, I’ve been curious what kind of power it’s actually making to the wheels. So, I went ahead and scheduled a dyno appointment.

Here is another video, with a loud backfire out of my midpipe (axleback section removed after it started rubbing).

The best numbers were 448whp and 501wtq with SAE correction. It looks like all the N54 guys use STD correction instead and that converts to about 468whp and 523wtq!

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Here are my modifications to reach this power:

TUNING
JB4 Map 6 @ 22psi + MHD BMS E85 KR flash
JB4 Tuner
JB4 Wireless Connect Kit
MHD Flashing Cable
OTG USB Adapter
Free MHD Backend Flashes

PERFORMANCE UPGRADES
Turbo Inlets
Catless Downpipes
7″ Intercooler
Charge Pipe
TiAL Blow Off Valve
Exhaust
Oil Catch Can
NGK 5992 Spark Plugs
Fuel-It Stage 1 LPFP with E60 fuel
BMS Cowl Filters
Upgraded PCV

TRANSMISSION
335is/550i Clutch Upgrade
MFactory Single-Mass Flywheel
Race Transmission Mounts
BMW Performance Short Shift Kit
Teflon Shifter Bushings
Clutch Pedal Stop
Clutch Delay Valve Delete
JB4 No-lift-shift/2-step Relay
Redline D4 ATF Transmission Fluid
Redline 75W90 Rear Differential Fluid

BMW 135i or 335i Exhaust with MHD Burble Option

With MHD’s latest release of the “burble” exhaust option, I had to try it out. You only need a few things to make this happen.

Simply download the app, plug the flashing cable into the car and connect the OTG cable to the tablet. Then you can flash a map with your desired burble settings.

I have the burble option set to full aggressive. I have catless downpipes and a full catless exhaust with only one muffler. Take a listen… Continue reading BMW 135i or 335i Exhaust with MHD Burble Option