tuning?s

[double_u_4]

ok then, thanks. i will remove it all b4 the tune then

 

[double_u_4]

i was going to be gutting the precats here soon since i just changed the o2s & its throwing the 420/430 code. but do i need to have this done b4 the tune is done or can i have the tune done 1st then gut them. would it make a difference if i do it after.

 

[Heywood]

Yes it will make a difference. Gutting the precats has very similar effect to installing headers.

 

[double_u_4]

Yes it will make a difference. Gutting the precats has very similar effect to installing headers.

is that making a difference performance wise or will it need to be tuned out with the tune

 

[aboythatskates]

is that making a difference performance wise or will it need to be tuned out with the tune

both.

 

[double_u_4]

so then i will need to have them gutted b4 i tune it, if i gut them b4 the tune would they still need the mils.
or what if i tune it then gut them,

also for the MIL's does it matter which 1s i use. i saw some1 recommended these & they seem to just plug in,
http://www.americanmuscle.com/stmilel.html
Or i found these, but they seem to have to be spliced in. these are a lot cheaper. but dont have the plugs.
http://www.ebay.com/itm/Mustang-MIL...594?pt=LH_DefaultDomain_0&hash=item20c4d29d22

 

[Heywood]

No need for MIL eliminators if you get a tune. CEL will come on because of the gutted precats, but then when you get the tune they will remove it.

 

[double_u_4]

ok so i can go ahead & gut them. i wont need the mils then.

& when u say they will remove them with the tune, will they just be resetting the CEL or removing it from the computer all together

 

[vaboom123]

I believe the tuner will "tune out" the rear oxygen sensors that are there to monitor the cats. This allows the car to run fine without tripping the CEL.

 

[FastFord]

They will turn the stuff off in the tune completely, so once you return the tune back to stock you will have a CEL.

 

[double_u_4]

ok, but out of curiousity y would i want to put the tune back to stock, would that b if i sell the car or was to put the 2.5 back in?

 

[aboythatskates]

only if you put a 2.5 back in. which i have never heard of happening so i dont think u should worry about that

 

[double_u_4]

ok im gonna try & gut the precats this weekend. but if i dont get it done b4 the tune wed. can i still have the precats tuned out then gut them afterward

 

[aboythatskates]

i would not recommend that

 

[double_u_4]

well im gonna get out there & try tomarrow. so then i just need to drop the 'Y' pipe, & stick something up the manifold & scrape the insides out. then the other i need to drill a hole & do the same rite. is that all. then they will tune it out when i go. is it going to be ok to drive for a few days with them gutted. b4 the tune with out mils.

 

[Heywood]

Will be ok to drive. Don't forget that you need to have the hole you drill welded back up. I'd also suggest starting the car before you reconnect the Y pipe for a couple of minutes to make sure all the material is blown out.

 

[aboythatskates]

you wont beable to scrape it iv tryied. you need a wood boring drill bit, that is about a foot long or so. and stick it in there and start drilling

 

[double_u_4]

ok. ya my brother in law is a welder, he said he can weld the hole for me. i was planning on running the car to blow that crap out b4 i put it back together.

 

[double_u_4]

Well went to do the gutting & it looks like they already been gutted. There wasnt anything in either of them. & while trying to drop the ”y” pipe i broke 2 of the studs & now i cant get them out. Also i hear what sounds to b a huge rock rattling around in yhe main cat.

 

[Heywood]

Well that would explain the codes.