catless downpipe

  1. An Evolution Racewerks Upgrade

    Searching for more power? A downpipe is an excellent source for horsepower! Since a turbocharger is essentially a pump, it’s important for the pipes leading up to and exiting the turbo to have unrestricted airflow. Factory downpipes generally are highly restrictive as they have catalyst material formed into "honeycomb" weaves. Exhaust gas must pass through these tiny "honeycomb" weaves on their way to the exhaust system thus causing a major exhaust flow restriction. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down.

    See More

    Read more »
  2. M4 Convertible Gets a Full Akra Set-Up & More

    When this M4 came to our shop for its appointment, it was bone stock with exception to the trunk mounted Aeromotion carbon fiber wing. Once it was on our lift we proceeded to install a full Akrapovic exhaust set-up, which included the Evolution titanium system along with the stainless steel catless downpipes. K&N performance air filters and a JB4 tuner were then installed under the hood to maximize this convertible's power output. Next we installed an RKP carbon fiber rear diffuser, which compliments the Akrapovic carbon fiber exhaust tips nicely, along with the M Performance carbon fiber front splitters & lip. You might notice that this F83 retains its chrome trim and orange reflectors; that's because the owner was explicitly focused on maximizing the car's power and aerodynamics instead of its exterior cosmetics. While this M4 convertible probably won't appeal to the more conservative BMW enthusiast, there's certainly no denying that it must be a blast to drive around Southern California. Enjoy.

    Read more »
  3. Our Project M4 Competes in the European Car Tuner GP

    Every year we participate in the European Car Magazine Tuner GP with one of our project BMWs. Having previously competed with a supercharged E92 M3 and a supercharged E86 Z4M, this was the first year we showed up with a turbo car. With our M4 putting down 559hp and 605ft-lbs tq at the wheels, we made some changes prior to the event to help this beast handle the race track.

    While lowering springs are perfect for the street, the track demands a bit more. We opted for a set of KW Clubsport 2-way adjustable coilovers, which enabled us to dial-in the optimal settings for the highly technical Streets of Willow Raceway. We then installed a front/rear Brembo GT big brake kit for better stopping power and fade-free performance. Like many of our track-going customers, we installed a set of strong and lightweight 18" Apex EC-7 wheels wrapped in the event required Continental Extreme Contact DW tires.

    Just like every other year we've competed, we drove our M4 to and from the event to prove that it's a double duty street/track weapon. Our driver, Jordan Yost of Yost Autosport, piloted the F82 and put down some awesome lap times. To get all the details you'll have to wait for the European Car Tuner GP issue to hit newsstands sometime early next year, but for now you can check out these exclusive photos and video from the event. Enjoy!

    Read more »
  4. Black F32 435i in the Wild

    The last time we saw this Black 435i we installed a set of Matte Black Vorsteiner VSE-003 wheels. However, by the time the car was finished, the sun had set and we only had time for some quick "in the shop" photos. Thankfully, the owner of this F32 was kind enough to recently send us some of his own photos (which are very excellent, by the way). Since we've seen it, the car has gained quite a few modifications, including H&R springs, an intake, a catless downpipe, a JB4 tune, methanol injection and some black painted accessories. From the looks of it, this highly tuned 435i is ready to take on the M4.

    Read more »
  5. BMS N55 Catless Downpipe & JB4 Installation

    Unlike the naturally aspirated S65 engine in the M3, the turbocharged N54 and N55 engines used in the 335i are very easy to make substantial power gains with bolt-on modifications. Simply by swapping the restrictive stock intake and downpipe with free flowing replacements and adding a tune, this E90 N55 335i gained 44whp and 75wtq! These highly effective bolt-on modifications are the best bang for your buck if you're looking to increase you're N55's power output.

    Read more »