Hi All,

Wanted to share a clip of my current setup. Apart from the usual FI, AP, Armytrix, Remus and stock mufflers.

I could only find one other video with Meisterchaft’s GT stainless axelback.

I started my exhaust “adventure” with the following setups:

1. Stock headers, mike’s secondary cat delete (H-Pipe) with resonator delete.

Tone: PERFECT AMG sound.
Volume: maybe 10-15% louder than stock.

2. ARH headers with ARH high flow cats + mike’s resonator delete + stock mufflers.

Tone: High Pitched, Raspy and somewhat uncontrolled when WOT.
Volume: 45% louder than stock.

3. ARH headers with ARH high flow cats + Remus cat back.

Tone: Bassier, a little higher pitched than scenario
Volume: 10-15% louder than stock. Similar to stock headers + cat and resonator delete + stock mufflers.

Great sound. But was too muffled for me.

4. ARH headers with ARH high flow cats + resonator delete + Meisterchaft GT2 mufflers.

Tone: Bassier + AMG rumble back
Volume: 100% louder than stock. NASCAR loud. Got pulled over for just starting the car. Cop thought I was revving it in a parking lot.

5. Same as Scenario 4 with added set of Soul Performance 200CEL metallic cats very similar to HJS, but a little smaller diameter to fit them on the res delete pipes.
Tone: Bassier + AMG rumble + exoticness?
Volume: 50% louder than stock.

wanted to share this because it was quite the hassle chasing my “perfect sound”. The current setup allows you to hear the exhaust even at low rpms. But at the same time, go crazy at wot. In my opinion. It was everything I was looking for in an aftermarket exhaust. Took a lot of trial and error, but I found what I was looking for. Hoping this will help other members from playing around with different setups.

The video doesnt perfectly demonstrate the volume this system makes. To note: acceleration was about 50% throttle up to about 4/5K rpms. (Didn’t have enough room to open her up further). Temps was in the low 30s, so traction was going to be tough. Most people ask if the extra set of cats meant a loss in power. Possibly 2-5hp. But I can’t feel it on my butt dyno.

Will try and get a better video up soon!

they are high flow cats. So no where near the stock 4 cats restriction from the stock system.

With good high flow cats. You are not really loosing any flow. - that’s what I have learnt with my experiences anyway.

Some porsche builds have tested HJS high flow cats vs catless. And the gains are negligible. Have yet to dyno to really know. But the exhaust smell with 2 high flows vs 4 high flows didn’t make much of a difference. You still smell the combustion vs the stock with secondary cat delete.

High flow cats don’t loose all the power that headers make. There have been many tests showing that high quality metallic cats show anywhere from 0hp loss to 5hp loss.
In in terms of flow, these HJS cats show very little restriction. Lots of dyno out there to support the difference between catless + HJS High flows to be negligible.
http://www.m3post.com/forums/showthread.php?t=1473073
https://mbworld.org/forums/c63-amg-w204/497297-anyone-running-cats-their-headers.html
https://mbworld.org/forums/c63-amg-w...hem-quick.html (Another member with 4 cats on his LTH)
I think this is the best compromise for sound + power.

The consensus on this forum is that headers see about 25-50hp gains (wheel). If you account for super restrictive ceramic cats as the worst loss in power thats about 5whp per set of cats. Multiply that by two, and my worst case power loss is 10hp. Thats a fraction that i am totally willing to live with for the smell + sound volume. That said, i really need to take the car to they dyno, because the mid range pull felt alot stronger with the second set of cats.

You Tube