gutted cats from stock mid-pipe. need help fast! 2003 Mustang GT - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 5 (permalink) Old 05-25-2010 Thread Starter
4.6L Member
smokedGT03's Avatar
Joined: Mar 2010
Location: Brooklyn
Posts: 7
gutted cats from stock mid-pipe. need help fast! 2003 Mustang GT

hi everyone, i own a 03 gt. a few days ago i decided to gut out my cats from the stock H pipe. it wasnt a very smart desicion on my part but wats done is done.
a few problems accrued after i bolted the h pipe back on.
1-there is a leak, one in the left pipe where i welded and a leak on the right gasket.
2- a check engine light keeps going on but doesnt give me any codes, it gives me N/A.
3- i feel like i lost some power as well.

i am planning on buying a performence mid pipe once i get enough money, but for now are there any suggestions on wat i can do to fix these problems.

P.S. i do have 2 high flow magna flow cats, but they are 3 inch pipes instead of my 2.25 inch pipe, if i cant find a solution to these problems i will try to put the high flow cats on, but i rather go catless.

smokedGT03 is offline  
Sponsored Links
post #2 of 5 (permalink) Old 05-25-2010
michaelreynolds's Avatar
Joined: Apr 2009
Location: kilgore
Posts: 75
u did loose some bottom end torque but you gained top end horsepower.. probably more around 5500 rpm.. as for the 3" high flo cat... you can cut little triangular notches out of the tips of it all the way around, squeeze the tip down to the 2 inch and weld it up... problem solved just to mess around with mine when i took my exhaust off i started it up jus to see what it sounded like... they sound so bad ass!!!

michaelreynolds is offline  
post #3 of 5 (permalink) Old 05-25-2010
GT Member
4.6L Member
gostriderblack's Avatar
Joined: Aug 2009
Location: Longmont
Posts: 1,806
go to a muffler shop and they can weld it up for you, either take the cats out and put new pipe in or just fix ur weld.. you know you could have sold ur cats and mostlikely had enoughf to buy a new h or x pipe.. a muffler shop charged a buddy liek 20$ per side and he kept his cats and sold thiem for like 60$each

cams, and all basic bolt ons, arizen seats, cowl hood, and now my buckets got a hole in it (meaning im broke) but when i fix it ill have gears and some trany work
gostriderblack is offline  
post #4 of 5 (permalink) Old 05-25-2010 Thread Starter
4.6L Member
smokedGT03's Avatar
Joined: Mar 2010
Location: Brooklyn
Posts: 7
yeaa i know. i kinda ****** up, but w.e.
i just hate the sound the leak makes, its like a horrible rumble n it pisses me off
smokedGT03 is offline  
post #5 of 5 (permalink) Old 05-25-2010
S197 Mustang Owner
4.6L Member
S197 Member
hotshot's Avatar
Joined: Sep 2006
Location: West Caldwell
Posts: 12,672
Send a message via AIM to hotshot
you lost back pressure so you lost some power

Your O2 sensors aft of the cats are now angry because they know the cats aren't working or in this case gone

With a leak, i'd say it might be best to just purchase a brand new takeoff midpipe and go back to square one or weld up the leak

2007 Mustang GT Convertible Stage 0 E-Force #402 Supercharger, Brenspeed Tune (435/400), GT500 Fuel pump, Clutch Delete Option, Roush Front Fascia, Brembos, California Dream Hood, Qwitch latch flush mount hood pins, MRT Light Bar, J&M LCA's, BMR UCA, UPR catch can, 6000k, Pypes Bombs, Pypes X-pipe, Airbrushed Flame pieces under the hood, Clear corners, GT500 shocks , FRPP P-springs (rear), BMR Adj Panhard, E-Force engine covers
2012 Ford Focus SEL 5Dr with MyFordTouch, Auto-Park, 303A Package,

hotshot is offline  
Sponsored Links
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome