blackbenzz

What are the AFR's without a tune?

MBH motorsports

I will look tomorrow. Its only a matter or pulling up the charts. so its not hard.

BerBer63

what is the midpipe diameter and does it connect to the factory resonator? included with LTs?

Jae Duk

Don't go to LAX with the car! They might smog check you there

sflgator

Yes, it must be the RENNtech "upgrade 2" or what I call the "stage 2" ecu flash tune. I have this well, and dyno'd @ 418WHP.

avengerboater

I'd like to know as well.

Does it bolt onto the stock resonator via clamps, or will it have to be welded?

superlubricity

Really good stuff. Makes me want to say, "Fark the neighbors!"

Can you post some more data? What were the conditions for the stock dyno and for today? What correction factor was used?

You mentioned zero drone. What about at partial throttle/tip-in at low RPMs?

Timeless

Awesome job MBH...now time to start a thread on that 'other' forum that will surely get closed when you know who starts posting.

AlexCim

Fit RHD?

MBH motorsports

You have to cut the stock pipes before the second cats. Once cut correctly The headers will slip right on to the stock pips. At that piont you can clamp them. I recommend welding though. I was thinking about adding a small flex pipe in case the shop makes a bad cut. Most good shops have guys that can handle this job no problem.

When you give it gas you will hear all the noise coming from the back of the car. I've very envious of this setup My car has dron that will slip your head in half. Mainly because I have an muffler with a dead box chamber inside. And huge xpipe sitting right under me.

IMO Xpipes add drone, so if that something you want down the road maybe think about an Hpipe. RENNtech makes a nice one.

avengerboater

Thanks, Mike.

So is it accurate to say that this set of headers deletes only the primary cats and leaves the secondary cats alone?

In your previous posts, you said that the headers go up to the stock resonator--which would mean that it takes out the secondary cats as well? Yay or nay?

MBH motorsports

Yes. On this car there are no cats though. just the resonator. Our set up deletes the primary cats.

superlubricity

Wait, does this mean the "stock" car these were installed on already had the secondary cats removed? Any other mods? Charcoals removed?

avengerboater

That's great news, Mike! It comforts me a bit more to know that this set up only deletes the primaries, which is most likely more restrictive than the secondaries.

Also, since I'm so on-the-fence about the loudness of the car in the video you shot, it's good to know that that car was catless...which means me keeping my secondary cats will quiet the sound a little. Yay!

MBH motorsports

Tomorrow I will post a video from inside the car to show you how quit it is just under normal driving. I will add that to my list to things to do. Plus it give me a reason to drive the car.

AlexCim

Fit RHD?

Merc63

Looking to get these as well. Just a few questions I need answered first.

1. Was there any CEL produced?
2. If there was CEL produced, did you have to get it programmed out with the tune? Or did you just throw in the Renntech tune and bolt on the headers and everything was fine??
3. Any cutting, welding or modifying of the car, other then the exhaust to install the headers?
4. What is install time and will you be shipping to Canada?

Thanks

BerBer63

I was kind of hoping this was a no-cut option, so I could keep my stock exhaust intact. Any plans for a mid-pipe and I would be very interested, I guess I could also get some made with 3" piping.

BTW for Merc63, everyone will need some form of tuning to delete the O2 sensors from the primary cats, which causes the CEL.

TEXC63

Mike,

Great gains.. Any chance you could put the car on the lift and take a pic of the complete exhaust? This may clear up all the questions. Do you plan on doing anymore testing? Say a C63 with hi-flow cats? Just to keep things legal and all.

MRAMG1

Keep up the GREAT work Hooley

MBH motorsports

You want a secondary cat delete pipe? I will see if I can accommodate that.

Sincity

Nice numbers!

Dads C63

Mike,
A lot of guys are waiting for test information. I am not picking on you. These are questions that need to be answered in order to sell them.

What was the actual tune used? Find out for sure, its important for potential customers.
What was the A/F on the results given? That info should be on the graph.
What was the temp, humidity, and baro for the tests?

On the test mule:
Did you have any cats at any time for the stock or "tuned" tests?
What air filters were used if any?
Are the charcoal filters in?
Did it throw a trouble light with the stock and "tune"?
Did the "tune" used eliminate the trouble light?
Were the stock resonators and mufflers attached when the dyno tests were performed?

Final product:
Will eliminate the primary cats.
Will utilize the secondary cats?
Will the system come with an option of cats? What cats?
Will the system require welding and cutting the stock exhaust??

Will you eventually offer a tune to match these headers so its a tuned matched set? If not, what tuner will offer one to eliminate the cels?

I know this is a lot of questions but they are very important to potential customers. Again, congrats on your results.

Sincity

Great set of questions. I was a little confused reading the posts myself.

yooker

Is deleting the resonator necessary or does it not have any effect on the gains/loss of horsepower.

Also how much more hp gain is there between catless and secondary cats?