Goni C63

Hi guys thinking about removing my primary cats, I delete secondary cats already I like the sound, if I remove primary cats!

Would I get any drone in side of the car?
Would the sound get better or to loud?
Would I gain any power?

Would like to hear what you guys have to say thank you for your time!

Sincity

It's freaking loud. Jeffield did it to his first C63 and I don't think he'll do it to his second one. There is a slight drone when I sat in it.

CoolBDPhenom03

Yes, loud, yes.

mthis

When u guys say loud , do you mean loud like a c63 with LT's ? Or louder?

Goni C63

Thank you guys,how about is any hp gain is well beside loud!

CoolBDPhenom03

LTH + no cats will be the loudest. I haven't heard a car with just no cats so I couldn't tell you how much louder than stock it would be or how soft it is compared to LTH.

HP gain if you do LTH + no cats could be within the 40+hp range give or take.

SROC276

Real loud and you will kill people walking behind the car with your exhaust fumes...if your planning that get long tubes or it be a waste. You will get more power but not as much as mids or long tubes.

mthis

Your saying its really loud like its louder then having headers?

Have U tried keeping stock exhaust stock pipes just cut out all the cats?

Karl901

It is out of control loud fun.
I running cats less, LTH, full Akrapovic!

Goni C63

Thank you for the all replays guys but I do get it, but i wanted to know specificly about just delete primary and secondary cats, power gain,if any drone, how loud, I have a friend of mine with costume exhaust and LTH and heard that in person, I just wanted to hear if some one have done to there cars just what am asking please and if anyone have any sound clips thank you again guys for your time and looking at my tread!

gzim335

just do it and report back

SROC276

My best guess is there will be drone and it will be as loud as a car with long tubes. I don't think it will sound as good without headers but then again never tried it. If your planning on cutting them out, you will need a tune to run the car anyway so might as well maximize it all and get some headers. You will not have anything close in hp to a car with long tubes

dchl21

don't do it... its gona smell

Goni C63

[QUOTE=dchl21;5751306]don't do it... its gona smell[/QUOT

what you meen buy smeling, inside a car?

CoolBDPhenom03

From Wikipedia:

A catalytic converter is a vehicle emissions control device which converts toxic byproducts of combustion in the exhaust of an internal combustion engine to less toxic substances by way of catalysed chemical reactions. The specific reactions vary with the type of catalyst installed. Most present-day vehicles that run on gasoline are fitted with a “three-way” converter, so named because it converts the three main pollutants in automobile exhaust: carbon monoxide, unburned hydrocarbon and oxides of nitrogen. The first two undergo catalytic combustion and the last is reduced back to nitrogen.[1]

So basically, if you eliminate the cats, you can smell all if the exhaust fumes. Not really in the car, but certainly outside.

Goni C63

Thank you very much guys for your input I really appriciate and I guess I will be going cat less so let's see what happen

dchl21

smells like rotten eggs

Djmouz63

do it!

MaroonC63

I am catless, no LTH. One, the smell is absolutely horrible, smells like an old diesel truck. A lot of people will give you the finger because of how loud it is, wether youre at WOT or just on the pedal a tiny bit. i only notice a drone at around 1.5-2k rpm, its bad at 55-65 MPH then it disappears. It will also attract a ton of attention, so make sure you don't get anyone angry. It does come in handy when you want someone to move, just give it a quick rev! I can't tell you anything about gains, as i've never dynoed. But i raced a tuned catted c63 and pulled on him every time so that gives you an idea that the gains arn't bad. You'll also want a crossover, or you will lose some torque.

CoolBDPhenom03

The drone is only bad on uphill sections at low revs. At higher revs, the drone is less, but still present.

Osgee

Btw rotten egg smell is from a cat, so if you remove yhe cats you WONT get a rotten egg smell just more of an unburnt fuel smell

Karl901

Just keep moving , then there is no smell!

shea

I currently have no secondary cats, resonators, or mufflers... Its very very loud and does smell quite a bit. Heres a short video if it helps....

DuaneC63

LTH, no cats, stand behind when it revs and it will knock you down. Very few people remember what real car exhaust smells like, napalm in the morning.

MBH motorsports

I say let the car breathe Just keep in mind if could leave something more to be desired, by running no cats on stock manifolds. Good thing is we got a fix for that Until then, I say try it and see if you like it. It might be what you were looking for, if not hit us up and we can really refine the tone and makes some nice power too