question about my exaust and tune????

[Youngblood]

tomorrow i'm having the exaust done on my marauder. 2 1/2" pipping from the manifolds down to an x pipe and all the way back to my flowmasters. ill be taking out all 4 cats. now im running a lidio tune and i was told by him that removing the cats will affect my tune. im assuming the air fuel mixture will be off since ill have no cats and my 02s will be reading different. what can i adjust on my sct x3 to compensate for the change with the exaust. dont have the money to have a dyno tune so i wanna try and get it as good as i can with my x3. i know i wont throw a light because lidio turns off the catalyst monitors . but im worried about throwing a lean or rich code hence why im curious if there is anything i can do to correct it

[PonyUP]

This may not matter to you, but if you remove the cats, you won't pass emissions testing. As I understand it, you have basically 3 options

1) Bolt on Cats you can put in for the purpose of emissions
2) Cat casings that can give the image of converters 9no idea how this works)
3) Keep the cats

I just bought a Marauder that did not have the Cats and it failed emissions, so I had to have the Magniflows put on. Passed easily.

Just wanted to share

[FordNut]

Put on high flow cats.

[fastblackmerc]

Put on high flow cats.

Right, install 2 hi-flo cats in place of the 4 factory cats.

[musclemerc]

You CANNOT adjust the A/F with the tuner. Either way you will need a dyno tune for the correct A/F mixture high flow cats or no cats. Good thinking on the mid pipe swap but maybe you should wait till you can afford to do it right. Headers, high flow cats, 2-1/2" midpipe, dyno tune, etc.

[SpartaPerformance]

You CANNOT adjust the A/F with the tune. Either way you will need a dyno tune for the correct A/F mixture high flow cats or no cats. Good thinking on the mid pipe swap but maybe you should wait till you can afford to do it right. Headers, high flow cats, 2-1/2" midpipe, dyno tune, etc.

I agree, the biggest waste of money is when you rush into stuff. "I want in now now now" leads to wasted money money money. Do it once, do it right if you have to wait then so be it.

[dohc324ci]

Waiting is the hardest part of this hobby!

High flow cats w/headers of your choice along with the 2.5" piping.

[PonyUP]

I can tell you the set up I have is 4.10 Gears, Kooks Headers,CAI, Hi-Flow Cats and custom tune, and she runs absolutely the way I want her to, short of putting on a blower. +1 the posts above, wait until you can do it right, otherwise you end up peicemailing everything and it never gets to where you want it to be

[4play]

Removing the cats should not affect you A/f ratio, the o2 sensors that controlls that is before the cats so the cats have nothing to do with the A/f ratio, the downstream o2 sensors only monitor and act like a on off switch for your check engine light. When it senses that the cats are not cleaning the air.

[FordNut]

... im running a lidio tune and i was told by him that removing the cats will affect my tune...
I'd say this guy ^^^ knows more about his tune than this one VVV.

Removing the cats should not affect you A/f ratio, the o2 sensors that controlls that is before the cats so the cats have nothing to do with the A/f ratio, the downstream o2 sensors only monitor and act like a on off switch for your check engine light. When it senses that the cats are not cleaning the air.

The O2 sensors only control the AFR at part throttle. At WOT the tune uses a lookup table.

[Youngblood]

thank you..i apreciate every ones input. i was debating if i was going to do hi flow cats. id love to do headers as well but money is an issue the reason why im doing my exaust is because i have 2 bad cats on my car. so for now ill be doing no cats with an x and my guy who is custom bending it all is doing it for 150 and im supplying the xpipe which really is a great price. i plan on doing long tubes within the next month or so so i when i have the money ill do the lt and 2 high flow cats s. getting an inspection is not a problem i have ways to deal with that lol. for now im just worried about how nice itll sound. and taking out the bad cats before they completely break apart and i start burning up some valves. id cut out just the 2 bad cats ..but just my luck its the drivers side upper and pass side rear cat...so i say the hell with it why not take them all out. plus ill most likely make my money back when scraping the old cats

[FordNut]

thank you..i apreciate every ones input. i was debating if i was going to do hi flow cats. id love to do headers as well but money is an issue the reason why im doing my exaust is because i have 2 bad cats on my car. so for now ill be doing no cats with an x and my guy who is custom bending it all is doing it for 150 and im supplying the xpipe which really is a great price. i plan on doing long tubes within the next month or so so i when i have the money ill do the lt and 2 high flow cats s. getting an inspection is not a problem i have ways to deal with that lol. for now im just worried about how nice itll sound. and taking out the bad cats before they completely break apart and i start burning up some valves. id cut out just the 2 bad cats ..but just my luck its the drivers side upper and pass side rear cat...so i say the hell with it why not take them all out. plus ill most likely make my money back when scraping the old cats

If you're getting it done for $150, it's not mandrel bent nor stainless. Better off finding somebody who has replaced their system and still has the cats laying around. They bolt right in.

[musclemerc]

thank you..i apreciate every ones input. i was debating if i was going to do hi flow cats. id love to do headers as well but money is an issue the reason why im doing my exaust is because i have 2 bad cats on my car. so for now ill be doing no cats with an x and my guy who is custom bending it all is doing it for 150 and im supplying the xpipe which really is a great price. i plan on doing long tubes within the next month or so so i when i have the money ill do the lt and 2 high flow cats s. getting an inspection is not a problem i have ways to deal with that lol. for now im just worried about how nice itll sound. and taking out the bad cats before they completely break apart and i start burning up some valves. id cut out just the 2 bad cats ..but just my luck its the drivers side upper and pass side rear cat...so i say the hell with it why not take them all out. plus ill most likely make my money back when scraping the old cats


Youngblood, the valves are in the engine not the exhaust. The problem you have is not to add or to delete cats. Your problem will be the larger diameter pipe. Most tuners turn the rear O2 sensors off in the tune anyway. If you notice alot of these guys have deleted the rear cats. I gotta say for 150.00 it will be crush bent aluminized pipe. FYI without all 4 cats that thing is gonna be LOUD so get some earmuffs. :burnout:

Look in the for sale area MDRider88 has a complete catted X pipe exhaust with Cobra shorty headers for 400.00. This on the other hand is a better value considering it will bolt right up and go

[FordNut]

Look in the for sale area MDRider88 has a complete catted X pipe exhaust with Cobra shorty headers for 400.00. This on the other hand is a better value considering it will bolt right up and go

A much better investment than throwing $150 in the trash for a temporary fix.

[Youngblood]

i know the valves arent in the exaust lol. my cats are breaking apart and are clogged and im worried about the build up of heat and pressure which in turn can damage my motor. the guy doing my exaust is good. he does amazing work and is doing the exaust as a favor plus some cash. hes done multiple exausts for a few of my friends rams, evos, mustangs. ill most likely throw headers on it soon. i wont be able to afford lts. so what type of shorties can i go with? will and header off a cobra work without clearence issues?

[FordNut]

itsawasteoftimeandmoneytoputcr ushbentpipeonanycar

[4play]

how do you know they are clogged? did he take a temp reading of all 4?

[LANDY]

i have some cobra manifolds that i took off my car, Pm me with an offer.

[musclemerc]

Well, where are the pics youngblood?

[fastblackmerc]

How do you know your cats are breaking up?

[Youngblood]

exaust came out good..sounds great just gunna swap out the mufflers because im not crazy about how raspy the flowmasters sound. ill try and put the car up and take some pics of the finished product. will removing the resonator sin the tips help with the raspy sound or just make it louder? some one told me the resonators make the exaust sound like crap

[musclemerc]

The raspy sound is from the X pipe not the mufflers. Deleting the resonators will make it louder, it must be pretty LOUD now without the cat's

[Youngblood]

yeah its pretty loud and i lovee itt..the mufflers are way 2 free flowing on my car the guy who owned it put em on b4 i got the car. i love magnaflow so ill prob swap them out next weekbut for 150 im very happy with the outcome. just gotta get rid of these gross flowmasters and shes gunna sound perfectt

[LANDY]

actually im pretty sure the magnaflows free flow better than the flows.
but they do sound better in my opinion.

[4drcbra]

I have an 04 MMR and I have done the 4 inch Anderson Intake and had a one off 2.5 inch exhaust built with rear Cat delete and 1 7/8 inch H-pipe and 3 inch magnaflows. Then a custom tune done and I made 328 hp and passes emmisions. I also reccommend waiting until you can do it right. The Marauder is not a fox body mustang that is fairly cheap to build, parts are expensive to purchase and install. Im going with a positive displacement blower so Im holding off on long tubes for now

[musclemerc]

You have the FASTEST N/A MM on the net. 328hp with just a powerpipe and exhaust. WOW!!!!!

[musclemerc]

I would love to hear more about your MM.
I'm subscribing to this thread, maybe you will chime in 4drcbra

[Big Black Beast]

The raspy sound is from the X pipe not the mufflers. Deleting the resonators will make it louder, it must be pretty LOUD now without the cat's

I'm guessing the raspy sound is from running w/ NO CATS!

[FordNut]

I have an 04 MMR and I have done the 4 inch Anderson Intake and had a one off 2.5 inch exhaust built with rear Cat delete and 1 7/8 inch H-pipe and 3 inch magnaflows. Then a custom tune done and I made 328 hp and passes emmisions. I also reccommend waiting until you can do it right. The Marauder is not a fox body mustang that is fairly cheap to build, parts are expensive to purchase and install. Im going with a positive displacement blower so Im holding off on long tubes for now


You have the FASTEST N/A MM on the net. 328hp with just a powerpipe and exhaust. WOW!!!!!

Amazing. Most of us couldn't get over 305 with underdrives, electric water pump, headers, full exhaust, CAI, ported intake, bigger throttle body and MAF...

Ought to be close to the 12's N/A.