S63 AMG 4MATIC Coupe, S65 AMG Coupe (C217), Convert. (A217) 2014 -2021

do i need a tune if i add hi flow cats and exhaust ?

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Old 10-06-2023, 12:01 PM
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2015 s63 coupe 2018 s450 ,2016 X6
do i need a tune if i add hi flow cats and exhaust ?

i’m putting my downpipes with a hi flow cats and exhaust , do i need a tune ? and if i do anyone recommend a mild tune nothing crazy ?
Old 10-06-2023, 04:17 PM
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2012 CLS550
Yes you need a tune to add those. You can't go wrong with pretty much any of the popular ones. Renntech, Weistech, etc. I picked Weistech because they were close enough to drive to.
Old 10-06-2023, 06:39 PM
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2015 s63 coupe 2018 s450 ,2016 X6
if i do not get a tune right away will it cause any harm or not run correctly ? it is not my daily so if i have to i can let it just sit in the garage until i get a tune
Old 10-06-2023, 07:40 PM
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Porsche guy who drives SL63 w/ perf pkg AND perf suspension
you can put all kinds of hardware on a car, but the oem ecu program is designed to work with the oem system.
If you done re tune the car, the engine may work against itself, thinking theses too much air flow, or not enough fuel etc
Old 10-06-2023, 08:09 PM
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2015 s63 coupe 2018 s450 ,2016 X6
any recommendations? i don’t need nothing crazy just want it to run well with the downpipes and exhaust .. anyone know a easy handheld tuner i can order ?
Old 10-07-2023, 03:40 AM
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2016 S550, 1997 LS Swap Silverado. 2010 Jag XFR, 2003 G35 Sedan, 1999 LS6 swap Z28.
I BENT MY RODS THREAD - My Experience (M157) https://mbworld.org/forums/w212-amg/...ence-m157.html

Please read and watch the above BEFORE you go physical on your Benz.
You might think about just doing a tune, OEtuning has a +100hp +100ft.lbs torque tune I've been running for about 3yrs with absolutely no issues other than trying to stay out of JAIL for speeding. If that's not enough your plans still are viable. I too live close to both Weistec and OEtuning, but I like the fact that OE post their dyno runs on their web site for ALL their tunes.

Last edited by Bigg Willi; 10-07-2023 at 05:34 AM.
Old 10-08-2023, 11:23 AM
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Porsche guy who drives SL63 w/ perf pkg AND perf suspension
I would talk to renntech, and weistech, and tell them what you have, and ask for their ecu tune recommendations.
Old 10-11-2023, 09:25 PM
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2015 s63 coupe 2018 s450 ,2016 X6
update .. installed catted downpipes and exhaust it’s great these r the pics

sounds perfect it has the hi flow cats no cel light i used the spacers also switched over the stock valve motors so it’s a pretty quiet in comfort the. just opens up in sport and sport plus you hear all the burples … no tune runs great .. just a little faint smell but i was told that should go away soon since they are new and what ever industry oils need to burn off .. who knows but no smell in the cabin at all and just a faint smell from behind .. deff feels much faster and the pick up is very noticeable





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