2003-04 Mach 1 Registry Owners Club  

Best Mustang Parts

Go Back   2003-04 Mach 1 Registry Owners Club > "GO" Discussions > Exhaust System

Exhaust System Exhaust Q & A

Reply
 
Thread Tools Display Modes
Old 09-26-2018, 02:50 PM   #1
AlloyPony
Registered User
 
AlloyPony's Avatar
 
Join Date: Jan 2018
Location: Central Kentucky
Posts: 123
Cat-back vs. muffler swap

What are your thoughts on having new mufflers welded in place of the factory mufflers vs. buying a full 2.5" cat-back kit?

I'm currently running a Mac 2.5" H-pipe into the stock 2.25" cat-back. I'm trying to decide if the $500 is worth it for a 2.5" cat-back, or if there would be no performance difference over keeping the 2.25" piping and having different mufflers welded in.
__________________
2003 Mach 1 - TR3650 - Mac O/R H-pipe - Ford Racing driveshaft - Modified air intake - Nitto Motivo 315/35s on 10.5" FR500 wheels - Steeda clutch adjuster
AlloyPony is offline   Reply With Quote
Old 09-26-2018, 02:54 PM   #2
sutyak
it's soo-tack
 
sutyak's Avatar
 
Join Date: Nov 2002
Location: Fairmont, WV
Posts: 2,077
Re: Cat-back vs. muffler swap

Since your motor is basically stock, then all you are doing is adjusting the sound when changing mufflers or cat-back. I say if you like the sound now then leave it alone.
__________________
mark
2004 DSG Mach 1. Built motor. Turbo. 667whp
2006 Sonic Blue Focus. Built motor. Turbo. 12.4 @ 115mph (sold)
2003 DSG Mach 1. 12.65 @ 106 (sold)
sutyak is offline   Reply With Quote
Old 09-26-2018, 03:30 PM   #3
HAEG
Heppasketties
 
HAEG's Avatar
 
Join Date: Aug 2003
Location: Mercer County, NJ
Posts: 4,468
Re: Cat-back vs. muffler swap

I agree with Sutyak I just put my factory cats back on after 14 years of being off the car (i removed the factory exhaust at about 1,500 miles in 2003) I have noticed no HP drop just a noise level drop. The car is quiet now with a nice little rumble but nothing like what it was with a catted Bassani X-pipe and exhaust which is what I put on it back then. Currently I have the MRT mufflers and pipe after the factory cats and I feel it sounds like it did with the stock mufflers. I still have the factory mufflers and pipe but had to cut the pipe to remove it. The rolled tips are what i really like about the factory exhaust the MRT is rolled also just a larger diameter.
__________________
M1R Member #1829
2011 Shelby GT-500 Grabber Blue
W/SVT Performance Package
Born on Friday, 6-25-2010
Purchased 8-19-2010

2003 Zinc Yellow Auto I/UP (Build #8280 of 9652)
Born on Thursday, 7/17/03
Purchased 8-18-2003 first owner
Sold 8-19-2010 bought GT500
Purchased again 3-3-2017 fifth owner
Purchased for my wife to drive (but she knows I love the car)
HAEG is offline   Reply With Quote
Old 09-26-2018, 08:24 PM   #4
03Shadow Grey
Registered User
 
03Shadow Grey's Avatar
 
Join Date: Feb 2016
Location: Theodore Alabama
Posts: 283
Re: Cat-back vs. muffler swap

I would love to find a complete factory set up to go back too.
03Shadow Grey is offline   Reply With Quote
Old 09-27-2018, 08:55 AM   #5
4valve 4tw?
Registered User
 
Join Date: Aug 2011
Location: Coatesville, PA
Posts: 1,069
Re: Cat-back vs. muffler swap

In the end it comes down to grand total price, and if you got a deal on a cat back and are installing it in your driveway, it's usually worth it(especially for us North easterner's dealing with 15 year old, crusty, rusted metal).

If you know what you want, and aren't going to be spending more and more chasing a certain sound then the catback is one and done. If mufflers are $70 a piece let's say, that's $140. Maybe $80-100 for a shop to cut your old mufflers out and put new ones in. You're looking at $220-240. That's a decent discount vs most catbacks, but what's another $250 if you're keeping the car for years? Just wait for the catback you want to pop up used, and save yourself some money. You already have the midpipe, may as well match it up(plus, you get a good size set of exhaust tips). Not that the mufflers aren't the bulk of the gains, but it also helps each mod moving forward if you have plans.
4valve 4tw? is offline   Reply With Quote
Old 09-27-2018, 06:05 PM   #6
311-420
#6956
 
311-420's Avatar
 
Join Date: Sep 2007
Location: +♤$
Posts: 6,743
Re: Cat-back vs. muffler swap

Quote:
Originally Posted by AlloyPony View Post
What are your thoughts on having new mufflers welded in place of the factory mufflers vs. buying a full 2.5" cat-back kit?

I'm currently running a Mac 2.5" H-pipe into the stock 2.25" cat-back. I'm trying to decide if the $500 is worth it for a 2.5" cat-back, or if there would be no performance difference over keeping the 2.25" piping and having different mufflers welded in.
i've got some lightly used magnaflows if you're interested.
__________________
04 Oxford White
5spd IUP
Eaton 452/409
311-420 is offline   Reply With Quote
Old 10-01-2018, 11:00 AM   #7
AlloyPony
Registered User
 
AlloyPony's Avatar
 
Join Date: Jan 2018
Location: Central Kentucky
Posts: 123
Re: Cat-back vs. muffler swap

Thanks guys. I'm not necessarily looking for a certain sound. I'm more interested in squeezing power out of this thing. I figured that 2.5" pipe running into 2.25" pipe isn't doing my car any favors. And there is a small chance I will be doing some more power adders this winter. I was just wondering if anybody had experience with testing pipe sizes to see what the difference really is. If it's 5 HP I'll pass but if there's say, 20 or so to be found I'd go for the full cat back.
__________________
2003 Mach 1 - TR3650 - Mac O/R H-pipe - Ford Racing driveshaft - Modified air intake - Nitto Motivo 315/35s on 10.5" FR500 wheels - Steeda clutch adjuster
AlloyPony is offline   Reply With Quote
Old 10-03-2018, 08:31 PM   #8
Recon
Registered User
 
Recon's Avatar
 
Join Date: Nov 2017
Location: Hopinsville
Posts: 88
I could tell a difference in my Impala when I upped the exhaust size. These 4V’s should move enough air to tell a difference too.


Pick your poison.
Recon is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 02:29 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
(c) 2002-2013 Mach1Registry.com

<