63-AMG

I was wondering if anyone has this mod done with stock manifolds replacing the primary cats with high flow cats?
if so any issues CEL light and what are the gains?

63-AMG

lol 100 views no one wants to help

bhamg

Probably because no one has done that mod. Why bother with the trouble and expense to gain 8-12hp (my best guesstimate)?

63-AMG

With a tune am guessing gains would be higher, am just curious about what type of high flow cats would fit and if the CEL light would come on?

Merc63

Don't see why the cel would come on unless these new cats dont cut emissions like the oems.

lunarx

Why not replace both primary and secondary cats with a single high flow 200cel cat?
I'd also like to hear how it works, if someone does/did it.

DuaneC63

Ask Peter at ACG. They've done a few C63 exhausts that will knock you down when you stand behind the car.

Mort

4ramin has headers and 100 cell cats for the street. Not exactly the same but the only person I can think of off the top with replacement primary cats.

https://mbworld.org/forums/c63-amg-w...n-rematch.html

Merc63

He has a tune tho and that will kill the CEL.

You could always send ur ecu in to get the CEL turned off if it comes on.. I doubt it will though.

63-AMG

Your right the tune would but I dont think it would pass emissions or am I wrong?

Merc63

No clue about emissions. We don't have that here.

Sincity

Jeffield had a custom DP made that removed the primaries and it is LOUD! I think if you type 'Jeffield' in youtube, you may be able to see his vid. I thinnk GT Pro may still have a DP and Fluid Motor Union at one point was flirting with the idea.

whipplem104

I made a straight pipe setup for Superlubricity a few years ago. Before he had long tubes. He had the plm headers though. We put spark plug spacers in for the rear cats and no check engine light. Sounds basically as loud as a header car. We were going to do an x pipe on it but moved on. Look up his thread on this and you can see what was made. They are hanging on my wall at the shop with his old carbon fiber hood.
Power was a little better on the top end but lost torque a little torque on the bottom.
I think the x pipe would have brought the torque back.