I'm not a mechanic, but I do work on my own cars. Is it possible to upgrade the front and rear calipers on a 2012 G37x Sedan? I want to go with a four piston front and a two piston rear. Is it possible without modifications?

 

Yes, direct bolt on. You'll need new rotors and pads as well.

 

https://www.z1motorsports.com/z1-pro...ar-p-4296.html

 

Thank you!

 

That's a fairly priced, $1600 package, IMO. Plus $100 for SS lines. Plus $730 if you want 2-piece rotors. It can add up. Money saved if you DIY, otherwise add maybe $300 to $400 for installation at a trusted shop. Most shops charge a higher rate when you bring them your own parts.

OP, only you can answer if it's worth it. From a performance perspective on a street car... meh. From a looks perspective, again, only you can answer that.

Also, be sure your front wheels can clear the BBK calipers. You're in for a huge budget-buster moment if you don't have that resolved up front. If you still have the OEM 17" wheels on your G37x Sedan, they will not clear. Hard stop.

 

Thanks for the additional insight. I already considered having to upgrade both sets of wheels. My ultimate goal is to drop a supercharger into my G, but planned on upgrading stopping power first. This will be a couple year project and any additional insights is appreciated.

 

FYI - if you get these BBK then your current spare tires won't clear the BBK so you'll need to get another spare tire from a G37 Sport.

 

Check out this thread by our very own blnewt:

https://www.myg37.com/forums/brakes-...the-cheap.html

As for the install, it's fairly straightforward. When I had my '11, I let my mechanic do it. This time around on my '12, I tackled it myself and it was a fun job. No real snags to report. Saved myself about $400 in labor as well.

The only real modification will be to the dust shields. The larger rotors will not fit without trimming them. I made several cuts in the metal and then used a set of vice grips to pry them open like a sunflower. The rotors fit just fine after that. You can re use your brake lines provided you source the shorter banjo bolts. I decided to go all in and upgraded to the SS lines posted in blnewt's link.

I also got the motive "power bleeder" to simplify the bleed process, since you'll have two bleed valves per caliper.

Everything went as planned, and the results were fantastic.

Feel free to post any other questions that you may have, and I will do my best to answer.
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40k miles later my dust shields are getting a bit rusty (MA car though). I'll order the sport shields when I have to replace the wheel bearing.

+1 on the power bleeder. Makes hitting all 8 bleeders a breeze. 20mins from setup for full flush & cleanup.

I accidentally crossthreaded the aluminium caliper on my install. It torqued to spec, but I discovered the mistake when I had to replace a scored rotor.
​​Easy fix with a helicoil kit and a friend (or makerspace!) with a drill press.

All & all, very happy with the looks, performance and installation learning experience.