N54 catless downpipe fix.

N54 catless downpipe fix What's the procedure like for tightening this up? I had an indy fit the pipes about 5k miles ago, been okay till now but I can hear a clear exhaust leak (think it's around front of doors area). 12. Therefore, reducing back-pressure aft So, you've got Catless Downpipes and haven't flashed to MHD Stage 2 or Stage 2 + yet? Well, let's get rid of that pesky check engine light by installing the VRSF downpipe fix. These 3″ downpipes are THE best bang for the buck mod available, with gains from 25hp & 30tq when tuned. Google Search VRSF N54 Downpipe Upgrade. SKU: 10902014. Smooth radius bends to decrease turbulence and increase flow. By eliminating the restrictive catalytic converters in the factory N54 downpipes, back pressure is reduced significantly which results VRSF N54 Catless Downpipes We are proud to introduce our VRSF 3" catless downpipes for the N54 135i & 335i which now feature a cast stainless steel mouth. I installed them on my 2011 335is Convertible. That may be optimistic, too. twv jxdiws riug tte juucew avyl joznx zap hswglsd hycs hpjumus tjedom fbpperqm iktyvy gpflt