SicShelby

I raced an Audi Q5 in the daily driver today - you know, the one with the hood popped up at Cars and Coffee today? I lost. Raced a cracked out Lancer too on Westerville Rd at 270. Anyone know who that was? It was a dark color with black rims and fast. Like crack fast. Lost that one too. Then I tailgated a new Camaro. B!TCH.

WELL. Buncha yellow bellies.

WEEEEEEEEEEEEEEEEEE!

But... funny!

Lotta dem running around lately...

Yay weather! I'll be there!!

You're right. Lol my brain doesn't operate on little sleep. But anything I think I got my answer - manual cutouts, weld them in. And... precat if I need an extra dash light.

I think you summed it up better, lol. Honestly... I have a decent amount of horsepower - getting another 15 (more or less) from having them pre-cat isn't worth the tuning troubles to me. If I *did* elect to have them pre-cat, then like you said, I'm running a tune for them open, and one for them closed (if I wanted to be safe). At this point... I just need it to "sound" like it his some amount of horsey power.

The O2 sensor measures the amount of CO2 - obviously a byproduct from the magic happening in the engine. The O2 sensors are used to determine in real time your air to fuel ratio or A/F. Your A/F has a peak spot for performance, gas mileage, and emmissions. Granted when your stomping on the gas and hitting the track the feedback from the O2's mean fuck-all because it is running openloop. When your cruising down the highway or in town is when the system runs closed loop. Closed loop means your computer is taking the air intake, ambient temprature, ambient pressure, and the O2 sensor readings to ascertain how much air and how much fuel to put into the motor at its current workload to keep bad gasses (like NOx for example) out of the atmosphere. It also helps with gas mileage, adds to the longevity to the motor because your not going to be running it too rich or worse lean. Openloop is a set of predetermined fuel maps that are basically only used when your having fun in the car (i.e. flooring it or 100% throttle whichever term you want to use I care not). Putting the cutouts before the cats (o2 sensors) means your now robbing the information the cats receive from the exhaust, which means the computer isn't receiving the right signal, which also means its calculations for the A/F are now fucked. Hence post-cat. I want to avoid the mixed signals that would be experienced with the whole pre-cat ordeal.

You've got an eye for photos that's for sure, VERY nice! :nod:

Nice ride and welcome to CR. I think you're off to the right start with the suspension next year. Just like mine... it's a little "stilty."

The sound quality is better with cutouts after the cats. The tone is a little deeper and far less Raspy. The cats do a good job at pulling out a lot of the rasp and increase the good noise. Besides, no dealing with tuning issues as with the pre-cat cutouts. Putting the cutout after the cats means the sensors are receiving the signal. The computer can compensate and the motor is happy, and so is your wallet from the fuel you're saving (assuming you stay off the fun button). The computer reads the front and rear O2 sensor to do a check and make sure they're doing their job correctly by testing the exhaust straight out of the motor and again in/after the cat. If the cat fails at cleaning the exhaust further the computer will throw a code, If the A/F can't get balanced because an 02 sensor is bad it'll throw the code, etc., etc. Roger that?

Why in the world would I want them pre-cat?

EXACTLY why I would want them post-cat...

I think that the cutouts will be fine, granted the inspection is done with them closed. What California kind of puts out of question, however, is high flow cats, long tube headers (I think there are some that pass on shorties, but not sure), etc. Right now the cutouts are ideal because 1) I like LOUD, and 2) they are cheaper than axle backs and I can get my noise with a lot less $$$.

Wth ARE you?? Anyways... Keep in mind the Shelby is in Cali now The emission laws in place there are relative to a frog's asshole.

Why so, Brandon? Are the manual one's even that "cheap"?

NNNNO! I will NOT click for slides.

Whoa that's nuts. For a minute there... Obama came to mind.

I would be VERY interested in those pictures. :nod: And "refurbished" meaning clean them up or "refurbish" like renovate/replace?

Lol, that about sums it up. Basically a "muffler delete" that you can shut up if need be. I think I'm going to run manual cutouts - the reliability of electric ones just doesn't seem like something that I want to deal with. I'll make sure they are stainless and weld them in.

If he is I guess he knows not to sell them...

And also any advice on steel vs. stainless steel (stainless I would imagine) and weld in vs. clamp on (weld?)?

I'm seeing those on Summit's site, those and the one's Summit makes. Are yours electric or manual?

Affirm.