Jump to content

Recommended Posts

Posted

So to be warranty-denial-proof, should the 3rd cat stay as is? I'm not sure just how much more freely flowing the exhaust will be without it. If it's 2%,5%,15%, I'd probably just leave it on.

Posted

does anybody have the part number for the 18 inch Magnaflow muffler? i'm assuming it's the round muffler, but there are different lengths of the round muffler. Also for the 5.3, it's 3" in and 3" out correct?

Posted

I just went to another muffler shop that came highly recommended to have them remove the third cat. Once they got it up on the lift, lo and behold the shop who supposedly installed a magnaflow 18" in fact installed an 18" clone and used a much smaller diameter pipe to run the exhaust out to the tips.

 

Granted I take a lot of the blame as I took the original shop for there word (shame on me) They lost a long standing customer.

 

Anyway, The new performance muffler shop, removed the third cat and install a 14" magnaflow ( my DoD is turn off and I like the noise) ran all 3" pipe and I can tell you what a fing difference. I'm sure mostly do to the third cat, the 14" SS magnaflow sounds amazing and no drone I can hear.

 

The shop did all this for $320. I guess I need to go back to the other shop and get a kiss.

Posted

I just went to another muffler shop that came highly recommended to have them remove the third cat. Once they got it up on the lift, lo and behold the shop who supposedly installed a magnaflow 18" in fact installed an 18" clone and used a much smaller diameter pipe to run the exhaust out to the tips.

 

Granted I take a lot of the blame as I took the original shop for there word (shame on me) They lost a long standing customer.

 

Anyway, The new performance muffler shop, removed the third cat and install a 14" magnaflow ( my DoD is turn off and I like the noise) ran all 3" pipe and I can tell you what a fing difference. I'm sure mostly do to the third cat, the 14" SS magnaflow sounds amazing and no drone I can hear.

 

The shop did all this for $320. I guess I need to go back to the other shop and get a kiss.

Just curious you said tips referring to the first mod on the exhaust. If so two smaller pipes would flow the same or better the one 3 inch. Just didn't want you to feel rip offed if that was the case.

Posted
I just went to another muffler shop that came highly recommended to have them remove the third cat. Once they got it up on the lift, lo and behold the shop who supposedly installed a magnaflow 18" in fact installed an 18" clone and used a much smaller diameter pipe to run the exhaust out to the tips.

 

Granted I take a lot of the blame as I took the original shop for there word (shame on me) They lost a long standing customer.

 

Anyway, The new performance muffler shop, removed the third cat and install a 14" magnaflow ( my DoD is turn off and I like the noise) ran all 3" pipe and I can tell you what a fing difference. I'm sure mostly do to the third cat, the 14" SS magnaflow sounds amazing and no drone I can hear.

 

The shop did all this for $320. I guess I need to go back to the other shop and get a kiss.

 

I'd go back to the original shop with the fake magnaflow and get my money back. That's bull crap what they did.

 

 

 

Tapatalk via Moto X

 

 

Posted

I'd go back to the original shop with the fake magnaflow and get my money back. That's bull crap what they did. Tapatalk via Moto X

Yeah I got it in the truck. I'll be sure stop by!

Posted

Just curious you said tips referring to the first mod on the exhaust. If so two smaller pipes would flow the same or better the one 3 inch. Just didn't want you to feel rip offed if that was the case.

I agree, my point is the knock off muffler....

Posted (edited)

Just curious you said tips referring to the first mod on the exhaust. If so two smaller pipes would flow the same or better the one 3 inch. Just didn't want you to feel rip offed if that was the case.

That depends on how small they are, a 3" pipe will flow more than two 2" pipes.

 

But yeah... I'm not sure I would bother with my money back, I'm more the type to drive by about 2am and toss that knock off muffler through their window. I'm not condoning such an action, but... No wait.... Yes I am, I wish you were close, I'd go do it for you.

Edited by TDT
  • Like 3
Posted

That depends on how small they want, a 3" pipe will flow more than two 2" pipes.

 

But yeah... I'm not sure I would bother with my money back, I'm more the type to drive by about 2am and toss that knock off muffler through their window. I'm not condoning such an action, but... No wait.... Yes I am, I wish you were close, I'd go do it for you.

I'm not that far away from you, (Lawton) :-) I got this though, thanks. I agree it's not about the money more of the fact that the MF deceived me.

 

Mike

Posted

Just got my Flowmaster cat back system installed yesterday. It sounds perfect. Nice and deep but not raspy at all. When it goes into V4 mode you can hear a difference. It does not drone but its pretty annoying to me, so I got a Diablo tuner and turned off the DOD. With the V4 mode disabled the muffler sounds great when accelerating and can barely notice it at cruising speed.

Posted (edited)

I'm not that far away from you, (Lawton) :-) I got this though, thanks. I agree it's not about the money more of the fact that the MF deceived me.

 

Mike

Pic of knock off muffler? Edited by hodges25
Posted

Pic of knock off muffler?

I did not take a picture of it before I took it back to the other muffler shop on Friday. Sorry....

Posted (edited)

I did not take a picture of it before I took it back to the other muffler shop on Friday. Sorry....

I only say that cause my shop put in a MF muffler that I watched come out of a magnaflow box on my truck, underneath the MF it said magnaflow

CA761FBA-6FDF-41DF-8C6B-158ED38E4038_zps

Edited by hodges25
Posted

Yeah, the poser exhaust was not imbossed. Again, shame on me for not looking. The new one is stamped with the magnaflow name and logo and is Stainless Steel.

Posted (edited)

I only say that cause my shop put in a MF muffler that I watched come out of a magnaflow box on my truck, underneath the MF it said magnaflow

CA761FBA-6FDF-41DF-8C6B-158ED38E4038_zps

I think Mzodargs's "MF" was meant in a way regarding the fornication of a nurturing female figure. Edited by TDT
  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts
  • Member Statistics

    342,840
    Total Members
    8,960
    Most Online
    appletrav
    Newest Member
    appletrav
    Joined
  • Who's Online   4 Members, 0 Anonymous, 255 Guests (See full list)


  • Latest Articles

  • Posts

    • Thanks; I looked there a few minutes, and I think I can find something. I really never looked there, as I thought it was stuff like PTO/aftermarket bodies/accessories like snow plows.
    • This is a 1/2 ton thing ONLY.  All HDs 2020-2026 have the two speed transfer case, with Autotrac as an option.     1/2 tons 2019-2026, regular 4x4s come with a single speed case (no 4LO!), and trucks with Z71 ordered, or all Trail Boss trucks come with the 2 speed case.  2 speed case is also an option on WT, and is also standard on High Country.  
    • 2013 5.3 still to this day calls for the PF48 filter.  Which as a 15psi bypass pressure.     There is a TSB, 17-NA-157 that talks about the PF-63 and PF-64 filters which have a higher bypass rating of 22psi.    TSB HERE - temp.xml   "Beginning in 2012, the oil pumps began to regulate main gallery feedback instead of pump out pressure. This means that the oil pump now does not begin to regulate until pressure is built up to the main gallery. This change reduces the amount of time it takes to provide oil to the engine bearing and lifters during extreme cold start conditions.  Main gallery feedback oil pump control systems are present on the following engine families which use Spin-on oil filters: Small Gas Engine (SGE), Large Gas Engine (LGE), High Feature (HFV6) Gen2 and Small Block Gen5 gasoline engines. These engines with the main gallery feedback oil pump control systems are factory built with an ACDelco® oil filters"   It also calls out what engines use those filters.  The gen 4 small blocks were not on that list (LMG, LC9, L9H, L92, L94, L20, L96).  Gen 5 small blocks use the higher pressure filter.          That all said...   Your 7045 Napa filter is the PF63 equivalent, with 22psi bypass.  You are already using the higher bypass pressure filter.  You CAN keep using it, you don't technically have to use it though.  
    • Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉
  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...