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      03-02-2019, 11:57 AM   #1
truegret
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Drives: BMW 340i
Join Date: Mar 2019
Location: San Diego

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Seeking 340i B58M Catless downpipe recommendations

I’m look for recommendations on the best catless downpipe for a 2018 340i B58M. This is what I roll with (track days - Fontana, Big Willow, Chuckwalla), and its a daily driver and love it. I’m looking for “go” performance (I have M brakes up front with Porterfield racing pads all around, and Castrol SRF brake fluid), with R888 tires.

2018 340i B58M
JB4 tuner (love it)
100 octane

I typically run map 2. I’ve run map 5, but it goes to stupid mode when exiting a medium speed (60-80mph) turns.

Two questions:
Any recommendations for the best catless downpipe so that I can run map 5 (and whoop on my Porsche GT3 buddies - )?

I se 4” (VM) and 4.5” (VRSF) offerings ... what does my ‘18 340i require?

Thanks in advance!
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