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MRM Performance

MRM Performance B58 5" Catless Downpipe

MRM Performance B58 5" Catless Downpipe

Regular price $329.99 USD
Regular price $419.99 USD Sale price $329.99 USD
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**In Stock & Ready To Ship!**
NEW PRICE, NOW ONLY $329.99!!

MRM Performance is proud to introduce our new 5" Catless Downpipe, designed to maximize exhaust flow and minimize backpressure! Unlike most downpipes currently available, we have produced a 5" downpipe, which allows your turbo to breath freely with minimal restriction. An added benefit to the 5" design is a more aggressive, and deeper exhaust note compared to the 4.5" Catless Downpipes.

Features:

  • High Flow 5" Design
  • Faster Turbo Spool
  • Deeper & More Aggressive Exhaust Note Compared To 4.5" Counterparts
  • Gains of 40-60whp with tune
  • Decrease WGDC%
  • 304 Stainless Steel
  • Free MRM Performance Decal Included

Fitment:

BMW:

  • F-Series B58 M140i M240i 340i 440i 740i
  • G-Series B58 B58TU (Gen1 & 2) M140i M240i M340i M440i 540i 740i X3 M40i X4 M40i X5 40i X6 40i X7 40i

Toyota:

  • A90 A91 Supra

Installation Tips:

  • Make sure your V-band bolt is not near the turbo wastegate, as this can can result the wastegate arm hitting the bolt resulting in boost control issues. This is the most common cause of boost issues that people encounter after improperly installing their downpipe.
  • When installing the downpipe, ensure that it is not contacting the frame, trans, or any other point of contact. If it is clock the downpipe to a position where it does not contact. If your downpipe is rattling after install, this is likely going to be the culprit.

Modifying Downpipe For Larger Custom Midpipes:

For those of you looking to go with a larger diameter mid-pipe and to maximize exhaust flow, you can cut the end off of the downpipe and weld on whatever size pipe you need; completely eliminating the bottleneck for a full 4.5" downpipe. Great for fitting those 3.25" - 4.0" midpipes.

*This is not necessary, it's just an option for those with custom exhaust setups that want to get the least restrictive exhaust setup possible*

MRM Performance Downpipe - Maximum Endpipe Diameter

***TRACK USE/WALL DECORATION ONLY, THESE ARE NOT INTENDED TO BE USED ON PUBLIC ROADS OR HIGHWAYS, MRM PERFORMANCE IS NOT LIABLE FOR ANY UNINTENDED USE OF THIS PRODUCT***

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Customer Reviews

Based on 8 reviews
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G
Galen Bellis
Works well

The only complaint I have is that they don’t incorporate the orginal mount point on the new down pipe so it’s basically held by v band and exhaust past the down pipe

Z
Zack Reyes
It’s great

I ordered a catless downpipe and didn’t realize it was on back order. Once it became available I got it a few days later and installed it. It opens up the car so much and it sounds great.

K
Kelvin Adesanya
Great product

I love the 5" dp, pending install but I have heard it give sthe b58 a deeper tone and fast shipping too ofc, but overall great product, alot more ppl should know about this product.