Diameter/Piping for Secondary Cat Delete

X3818 · 04-07-2019, 08:49 PM

Hello

Haven't found someone in CA who's willing to delete the secondary cats on a 07 328i. I haven't looked around much, but have a fair amount of research on the cats themselves

Right now the mufflers deleted, & y pipe for resonator. Sounds deep and real nice, tons of burbles and some light pops

I'm looking to bring the pops out more so it looks like I'll have to DIY cut and weld.

Can anyone clarify the diameter of steel pipe I would need, to fit in the place of the cats once they're cut out? My research has led to mixed results ie 3 in or 2.25 in etc

The angles also seem awkward.
If anyone can recommend the exact pipes and fittings to purchase, I would be very grateful

Or if any experiences, please share!

Thanks!

X3818 · 04-09-2019, 08:54 PM

Bump

Found someone who will remove the entire exhaust to delete the cats, then re install. $400 and 8 hour job, I'd rather DIY

hassmaschine · 04-09-2019, 10:17 PM

The stock single exhaust is 2.5".

04-07-2019, 08:49 PM	#1
X3818 New Member 2 Rep 29 Posts Drives: E90 328 / E36 325 Join Date: Mar 2019 Location: CA iTrader: (0)	Diameter/Piping for Secondary Cat Delete? Hello Haven't found someone in CA who's willing to delete the secondary cats on a 07 328i. I haven't looked around much, but have a fair amount of research on the cats themselves Right now the mufflers deleted, & y pipe for resonator. Sounds deep and real nice, tons of burbles and some light pops I'm looking to bring the pops out more so it looks like I'll have to DIY cut and weld. Can anyone clarify the diameter of steel pipe I would need, to fit in the place of the cats once they're cut out? My research has led to mixed results ie 3 in or 2.25 in etc The angles also seem awkward. If anyone can recommend the exact pipes and fittings to purchase, I would be very grateful Or if any experiences, please share! Thanks! Attached Images
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04-09-2019, 08:54 PM	#2
X3818 New Member 2 Rep 29 Posts Drives: E90 328 / E36 325 Join Date: Mar 2019 Location: CA iTrader: (0)	Bump Found someone who will remove the entire exhaust to delete the cats, then re install. $400 and 8 hour job, I'd rather DIY
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04-09-2019, 10:17 PM	#3
hassmaschine Major General 3966 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	The stock single exhaust is 2.5".
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