I have a stock 05 GT and i am thinking about buying SLP long tube headers and catted x-pipe, will it past emissions, someone tried to tell me it wouldnt but i thought it would. And other question is how much louder then stock is it without a catback exhaust system, and finally is the install easy? Im pretty much tryin to get the most power for 1300 without getting a tuner or messing with the ecu.

 

It's easy as long as you know what you're doing. It will also pass emissions if you do get the catted x-pipe, but if you get an o/r pipe than it will not pass the emissions standards. As far as the sound, you can't just end your exhaust at your mid-pipes. If you get a loudmouth with all of that, you exhaust will be loud as hell. Some people have taken off SLPs because they're too loud and get annoying. Just w/e your preference is really.

 

i mean will it be loud iwth a stock catback

 

it will get louder..just not as loud as if u were to have an aftermarket catback

and if i were you, i would go w/ some other company if you can cause SLP is rediculous expensive

 

first you need to tell us what state you live in, because emissions are different in every state and in California for example long tubes won't pass emmisions no matter what.

 

Texas

 

YES, it will pass... They don't even do emissions checks on cars newer than 98 I think. They just look for the idiot lights and all the other basics stuff. I took my car to Firestone with BBK LTs, BBK O/R X-Pipe, and Magnaflow catback. The only thing that was plugged into my car was the cable to the on board computer.

Plus, if you bought the car new, you get 2 years before it needs to be inspected.

I'm from Texas as well.

 

Hey man. I have SLP LT's and SLP catted X-pipe on my 01 GT.

I had a shop do it but I was there most of the time. Install with LT's is a PITA with 99-04, so I'm not sure how much better it is with the 05+. As far as fitment though, fitment was beautiful with no problems. I've had them on for about 15 months with no leaking issues whats so ever.

I got the shop that was doing my install, to become a certified dealer for SLP. This saved me about $300 off of the price of the pieces. Total was about $900 after tax for the LT's and the catted X-pipe. Install was $600 for both.

It will give a very nice sound I bet with the stock catback. Since it's a muffler'd exhaust, it should give a decent tone. IMO stay with a catted X-pipe no matter what, even if there were no emission laws. The cats help give it a nice tone, rather pure grossly loud.

Feel free to ask anymore questions.

 

when i heard the first person say it would be rediculously loud with loudmouths i had to buy them
I cant find ANY shops in houston that will install the headers for me except one (overspeed motorsports) but i took my subaru to them to get a boost controller installed bc i was a car noob at the time and when i was driving home for some reason i didnt hear my turbo spool and my boost gauge wasnt working, they didnt even secure the lines that held the boost and my turbo wasnt getting any boost, so i dont even wanna try going to that place with this car. Think i could do it myself?

 

Grab a buddy or two and yes. All it really is, is a simple bolt on. It's just hart to read and get in there.

 

Ive got a write up on my site.

 

Robert, you'll love the LoudMouths. I have them on an otherwise completely stock '05 GT, and even after about 6 months of having them, I still can't get enough of the sound. Watch for peoples heads as you're driving around, when you get them installed.

 

ok so i got all my stuff, installed and everything, runs great sounds great. but last night my CEL came on, i took it in and this shop did a diagnosis for free and said it was code 430 which is a catalytic converter problem on my xpipe (which is SLP). I was told that it would not make my CEL come on and there we be no problems. Any solutions?

 

Rob:

A few things.....

1 - SLP makes great stuff.

2 - SES lights comming on after mods is nothing new. Happens all the time. Could be a problem with the install such as a leak etc.... There is a difference between sayng a code "won't" pop and a code "should not" pop. Follow me?

3 - Headers are a pain in the ***. They suck to install and are notorious for needing adjustments after you put them in.

4 - Adding LT's can cause problems with the tune. They will/can make a car run lean. IMO, installing LT's often time requires a dyno tune. You mentioned that you did not want to mess with the ECU and install headers and I don't see how the both can co-exist.

5 - The '05's ECU are very sensitive. Much more so then older years. On you car you can not even add a CIA w/o a tune modification.

6 - The industry is still learning when it comes to the new platform Mustangs.


With all that said, you need to find out why you have a code. A code stating a problem with a CAT does not mean jack. The code does not need to be read, the entire car needs to be road tested with a diagnostic device so that parameters can be datalogged. The CAT's do not have a sensor on them, so the ONLY way the ECU will think there might be a problem with the CAT is from the O2 sensor right after the CAT. Most likely it is seeing a rich signal....you car might actually be running very rich and thus the sensor thinks you have an emissions problem. I am sure that the CAT itself is fine.

I would suggest that before you pannick, go to this website:

www.modularmisfits.com

Sign up for the forum. Then place a post for a guy named Matt Hill. He is a good SCT tuner and should be able to help you out. Tell them that I sent you.

 

BTW, how does that bad boy sound? SLP makes great stuff. If you had a good-tuned ear you can hear your car running rich with that exhaust. It will tend to pop.

 

When I installed SLP LT's and catted xpipe on my 01, my CEL came on as well. Same problem as you. It's because the preliminary cats were eliminated and more fumes are going to the only 2 cats left. As waterdr said, the cars are very picky and sensitive. I just had my tuner turn them off with my Xcal2.

 

That would be true, I just assumed he still had both sets of O2 sensors. If he has cats, he should.

 

I still have both my sensor's and I still get CEL light.

 

After-market cats should not cause an SES. They work quite well. Hum....you may have an issue too. Ever had the car on a dyno?

 

mine also pop on and off occasionally...

 

Yea. Ran about 6 runs last year. Shop owned by a Mustang enthusiast who owns a 10 sec. 93 Cobra N/A. Also has built/tuned a 950RWHP 04 TT Cobra.

I can't remember his full terms, but it's because the Hi-flo cats are basically too hi-flow for the sensors.

 

yea well i am about go get the car dynod, im not sure that i really want to tune it yet, just because i dont have the money to fix the car if anything goes wrong, unless there is a way for them not to find out u used an SCT. I have been thinking of getting this though. not sure yet http://www.americanmuscle.com/sct-li...600-tuner.html

 

Your post is confusing to me.

The point of getting it tuned is to (among other things) ensure that the air/fuel ratio is correct. The dealer does not do this. It gets accomplished while on a dyno by a "tuner".

The tuner will use either a chip or a flash tuner to install the tune on the cars computer. SCT is a commonly used brand.

Why are you concerned about "them" finding out you used an SCT? Are you worried about warranty? If so, the moment you slapped on the headers the warrenty is most like over anyway. The headers pose more of a threat to a warrenty then an SCT device. You can always remove a tune easily if you have to have the car in for service. Header on the other hand, you can not.

 

yea i already asked about the headers my dealer said it was ok. only thing to be worried about is if the headers mess something up they said, then it wouldnt be covered, but there isnt much a header can mess up from what i was told. and the reason i dont want to get a tune is because (i dont know if ford does this too) when i had a subaru and they hooked it up to the comp they could tell that the car was tuned because it was running different.

 

On the XCal2, there is a feature that is "return to stock". You can just flash this back whenever you want, and everything returns back to factory settings. It's very nice for that specific purpose of warranties, dealerships, if you ever ran into a problem with a tune, etc. etc.

 

Aftermarket cats are high flow cats. Not only that, but you're going from 4-6 to only 2. Bassani cats are pretty good, Mac cats suck. So it all depends.

The dealer will say anything is "okay" to install. However, thats pretty much BS. If you ever want to bring your car in for warranty work, then it has to be 100% stock. I can gaurentee they wont do **** for you with those headers on even though they said it was okay. Dont you get it? They said it was ok knowing if you brought it in, you would be denied, so they pretty much lied to you to get out of any warranty work. All they have to do is link the headers to any problems. That includes your entire engine, who knows what else they could link it to.

 

I rather dish out the money for labor and parts at a local repair shop than to have the dealer do a repair under warrenty. I got screwed over twice and my dad gets screwed over everytime (since for every brake job he got, his stopping power decreases everytime).

 

I agree.