View Full Version : magnaflow hi flow cat
fukinavit
September 30th, 2015, 00:00
does any body know or have experience with these magnaflow hi flow cats?. id like to change mine out as before I got mine chipped I was getting an efficiency code. I actually like the standard SE exhaust sound but would just like to upgrade the cats. Does the sizing look right?, just a straight forward weld in replacement?
http://www.ebay.com/itm/Magnaflow-Exhaust-CARB-Universal-California-CA-Obd-II-Catalytic-Converter-441076-/181544106222?hash=item2a44df38ee&vxp=mtr
4.2Crew
September 30th, 2015, 12:28
I had BOTH oem cats "rattling" on my 2001 A6 4.2L after 200k+ miles... Hired a local muffler shop cut the oem cats out and weld in a pair of Magnaflow cats---No codes. I have no idea if they improved performance or not----but it quieted the rattling sound at low RPMs. YMMV.
fukinavit
September 30th, 2015, 14:59
I had BOTH oem cats "rattling" on my 2001 A6 4.2L after 200k+ miles... Hired a local muffler shop cut the oem cats out and weld in a pair of Magnaflow cats---No codes. I have no idea if they improved performance or not----but it quieted the rattling sound at low RPMs. YMMV.
so you had these exact cats installed? so I can order these and get the local exhaust shop to weld them straight in with no issues?
4.2Crew
September 30th, 2015, 15:15
so you had these exact cats installed? so I can order these and get the local exhaust shop to weld them straight in with no issues?
I cannot confirm and guarantee they are the EXACT Magnaflow cats you are considering---this was 7+ years ago...
All I was trying to get across is the main cats on a C5 4.2L were replaced with Magnoflows without issue using a competent local independent exhaust shop.
What is at issue here?..... Are your main cats rattling and in need of replacement? ...Or are you scrounging for more performance?
fukinavit
September 30th, 2015, 15:26
like I said, I like the standard exhaust and the sound, the cats are old and a little restrictive, the pre cats are already gutted so I thought I would help it breathe a little easier by doing the mains too. magna flow make decent stuff and at reasonable prices. I just want to pre order some cats, show up at the exhaust shop and have them put them in.
Turbowned
September 30th, 2015, 18:39
Magnaflow use ceramic core cats which can foul up easily if you're running the car a little rich. I recommend finding 100 or 200 cell metallic core cats which tend to be more durable if you play around with fuel/tuning. I know Random Technology makes the 100 cell but they say (like Magnaglow) that they may not meet requirements for highway use).