BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) - View Single Post - Are CATTED downpipes worth it on 135i N54?

bmwisme · 07-17-2026, 12:49 PM

I've been away from the forums for a few years, sorry if this has been asked prior: Can anyone share their experience replacing stock downpipes with high-flow "catted". I'm looking at VRSF high-flow "catted" but wonder if the upgrade is worth the cost (performance wise). It would run around $500 for the downpipes and I'd need a shop to install. Currently the only mods on my 70k mile 2008 135i are a VRSF 5" intercooler and VRSF charge pipe with a stage 1 tune. Car is in mint condition and a blast to drive but after a few years at stage 1 some addition horses would be fun.

Thanks in advance

07-17-2026, 12:49 PM	#1
bmwisme New Member 4 Rep 27 Posts Drives: 2008 135i conv. Sport Pkg. Join Date: Jun 2012 Location: Germantown, WI USA iTrader: (0)	Are CATTED downpipes worth it on 135i N54? I've been away from the forums for a few years, sorry if this has been asked prior: Can anyone share their experience replacing stock downpipes with high-flow "catted". I'm looking at VRSF high-flow "catted" but wonder if the upgrade is worth the cost (performance wise). It would run around $500 for the downpipes and I'd need a shop to install. Currently the only mods on my 70k mile 2008 135i are a VRSF 5" intercooler and VRSF charge pipe with a stage 1 tune. Car is in mint condition and a blast to drive but after a few years at stage 1 some addition horses would be fun. Thanks in advance
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