HP Gain on stock catback with weld in flows vs aftermarket?

Pittbull · January 16th, 2010, 10:52 PM

Ok so this may be a newb question but could i gain any hp if i went with a aftermarket catback exhaust over my stock catback with weld in flows? I plan on goin MAC LTs + Prochamber but im prob gunna b keepin my stock catback for sometime. I dont think ill see any noticeable gains but id like some other people's oppinions on this since im not to sure about it.

Dennis · January 16th, 2010, 10:53 PM

not enough to notice really but yes. dont quote me but i think the avarage gain is 3-7 or some shit like that

ajm · January 16th, 2010, 10:54 PM

Not enough to notice...or justify the amount of money spent. Put the money towards something else.

casper gt · January 16th, 2010, 10:57 PM

biggest diffrence you have is sound (yes it'll sound a little better). 3-5 hp is about where your at.

Pittbull · January 16th, 2010, 11:01 PM

yeh i didnt think it was much and im deff not going to b spending that much on somethin that gains so little anytime soon, i was just curious. i would like to have some 3" tips tho xD looks badass

wishIhada5.0 · January 16th, 2010, 11:57 PM

you wont notice a difference other than sound but there is a slight difference in power...SOTP wont pick it up though lol as far as tips go go 3.5"......3's look too small IMHO Magnaflow or SLP tips rank among the nicest

Pittbull · January 17th, 2010, 12:11 AM

I didn't it help my numbers to much at all and seeing as how I already have flows I'm pretty well of on exhaust atm. But I really do live the look of a big ass chrome tail pipe xD where u can tell just by lookin at it, its a aftermarket exhaust. Stock pipes just look.... Stock.. BORING

wishIhada5.0 · January 17th, 2010, 12:13 AM

you dont necessarily want chrome tips...all the shit that gets thrown up on em will make them pit eventually...polished tips can always be brought back to near perfect condition

Pittbull · January 17th, 2010, 12:17 AM

Chrome, polished idk! All I kno is SHINY

I didn't kno that tho thanks for the info ha

Parker03 · January 17th, 2010, 12:21 AM

I put weld in mufflers on mine just because I already had them. I thought it would of only made a difference in sound but I noticed the car revved up much quicker and could feel a slight difference. So I'd say the 5hp is about right

wishIhada5.0 · January 17th, 2010, 12:42 AM

If you want chrome the nicest I have seen are MAC's...polished goes to Magnaflows...with SLP bein a close second...Im a little biased though too lol

Pittbull · January 17th, 2010, 12:46 AM

I'd prob go wit magnaflow. Or maybe I can find someone runnin a prochamber with a non-MAC catback so I'd find out if they'd fit BEFORE I make a purchase. I mind as well go MAC all the way since I'll have the lts and the prochamber eh?

wishIhada5.0 · January 17th, 2010, 01:01 AM

why not mix and match what you like? If for some off the wall reason I would ditch the magnapacks in favor of say MACs I would still have my magna tips

Pittbull · January 17th, 2010, 01:16 AM

Only reason I say to stay the same is to avoid fitting issues Cuz that'd b a PITA.
Bu I agree with ya! Hell get BBK headers Magnaflow X and SLP loudmouth catback if it'll fit right why notxD

wishIhada5.0 · January 17th, 2010, 01:25 AM

My headers and H are both BBK....the H doesnt match the headers worth shit lol its off width wise by about 3/4" lol

Pittbull · January 17th, 2010, 01:35 AM

R u fukkin serious?! They r both bbk and they STILL don't fit? Haha dude that blows. I'd write a hate letter to BBKunts!

MikeJones · January 17th, 2010, 12:49 PM

slp says that a stock 03-04 cobra gains 25rwhp by just peplacing the catback. So yeash there is a difference. magnaflow says 8-15flywheel on there site.

ajm · January 17th, 2010, 12:52 PM

Originally Posted by mikejones16

slp says that a stock 03-04 cobra gains 25rwhp by just peplacing the catback. So yeash there is a difference. magnaflow says 10-15flywheel on there site.

In controlled environments....Very rarely can you purchase a part and see the actual gain stated by the manufacturer. Especially in his situation where he has already replaced the most restrictive part of the cat-back.

F8L GT · January 17th, 2010, 01:14 PM

Originally Posted by wishIhada5.0

My headers and H are both BBK....the H doesnt match the headers worth shit lol its off width wise by about 3/4" lol

thats because in the welding process, somethings end up warping. it just a given. but i do agree with you on the 3.5" tips. I did love the way my 3.5" Bassani tips looked but i no longer run them. I just dump after the mufflers now

ZenMGT · January 17th, 2010, 01:24 PM

don't mean to threadjack,,,but assuming everything BUT my mufflers are stock (including the pipe after the mufflers to the tips) - if it's all stock, and I wanted to replace JUST the mufflers, I'd be looking for a muffler with 2.25" in and out correct? ('02 gt)

January 16th, 2010, 10:52 PM	#1
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	HP Gain on stock catback with weld in flows vs aftermarket? Ok so this may be a newb question but could i gain any hp if i went with a aftermarket catback exhaust over my stock catback with weld in flows? I plan on goin MAC LTs + Prochamber but im prob gunna b keepin my stock catback for sometime. I dont think ill see any noticeable gains but id like some other people's oppinions on this since im not to sure about it. __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

January 16th, 2010, 10:57 PM	#4
casper gt Moderator 2012 300a gt auto 12.10@116 Join Date: Mar 2008 Location: creighton pa Posts: 7,697 iTrader: 4 reviews	biggest diffrence you have is sound (yes it'll sound a little better). 3-5 hp is about where your at. __________________ MM BRACKET RACING CREW CO-FOUNDER BAMA Performance Drag Team Founder 2012 300a GT auto

January 16th, 2010, 11:01 PM	#5
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	yeh i didnt think it was much and im deff not going to b spending that much on somethin that gains so little anytime soon, i was just curious. i would like to have some 3" tips tho xD looks badass __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

January 16th, 2010, 11:57 PM	#6
wishIhada5.0 April 2012 ROTM 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 4,083 iTrader: 0 reviews	you wont notice a difference other than sound but there is a slight difference in power...SOTP wont pick it up though lol as far as tips go go 3.5"......3's look too small IMHO Magnaflow or SLP tips rank among the nicest __________________ True blue crew founder/member #1 378/442 rwhp/rwtqon a Mustang dyno cams are in..#'s coming this summer

January 17th, 2010, 12:11 AM	#7
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	I didn't it help my numbers to much at all and seeing as how I already have flows I'm pretty well of on exhaust atm. But I really do live the look of a big ass chrome tail pipe xD where u can tell just by lookin at it, its a aftermarket exhaust. Stock pipes just look.... Stock.. BORING __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

January 16th, 2010, 10:54 PM	#3
ajm Banned Join Date: May 2008 Posts: 7,966 iTrader: 4 reviews	Not enough to notice...or justify the amount of money spent. Put the money towards something else.

January 17th, 2010, 12:13 AM	#8
wishIhada5.0 April 2012 ROTM 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 4,083 iTrader: 0 reviews	you dont necessarily want chrome tips...all the shit that gets thrown up on em will make them pit eventually...polished tips can always be brought back to near perfect condition __________________ True blue crew founder/member #1 378/442 rwhp/rwtqon a Mustang dyno cams are in..#'s coming this summer

January 17th, 2010, 12:17 AM	#9
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	Chrome, polished idk! All I kno is SHINY I didn't kno that tho thanks for the info ha __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

January 17th, 2010, 12:21 AM	#10
Parker03 Newbie 2003 Mustang GT 14.14@98.23 Join Date: Jul 2009 Location: Nova Scotia, Canada Posts: 31 iTrader: 1 reviews	I put weld in mufflers on mine just because I already had them. I thought it would of only made a difference in sound but I noticed the car revved up much quicker and could feel a slight difference. So I'd say the 5hp is about right __________________ '03 Tropic Green GT Performance: 4:10's, SCT3 91 tune, K&N CAI, 75mm TB & Plenum, Cherry bomb Vortech weld in mufflers, MGW SS Exterior: Mach 1 chin and grille delete, Tint Interior: Stock and extremely clean!

January 17th, 2010, 12:42 AM	#11
wishIhada5.0 April 2012 ROTM 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 4,083 iTrader: 0 reviews	If you want chrome the nicest I have seen are MAC's...polished goes to Magnaflows...with SLP bein a close second...Im a little biased though too lol __________________ True blue crew founder/member #1 378/442 rwhp/rwtqon a Mustang dyno cams are in..#'s coming this summer

January 17th, 2010, 12:46 AM	#12
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	I'd prob go wit magnaflow. Or maybe I can find someone runnin a prochamber with a non-MAC catback so I'd find out if they'd fit BEFORE I make a purchase. I mind as well go MAC all the way since I'll have the lts and the prochamber eh? __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

January 17th, 2010, 01:01 AM	#13
wishIhada5.0 April 2012 ROTM 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 4,083 iTrader: 0 reviews	why not mix and match what you like? If for some off the wall reason I would ditch the magnapacks in favor of say MACs I would still have my magna tips __________________ True blue crew founder/member #1 378/442 rwhp/rwtqon a Mustang dyno cams are in..#'s coming this summer

January 17th, 2010, 01:16 AM	#14
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	Only reason I say to stay the same is to avoid fitting issues Cuz that'd b a PITA. Bu I agree with ya! Hell get BBK headers Magnaflow X and SLP loudmouth catback if it'll fit right why notxD __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

January 17th, 2010, 01:25 AM	#15
wishIhada5.0 April 2012 ROTM 2002 GT, True Blue, Stick Join Date: Feb 2008 Location: About an hour east of Pittsburgh Posts: 4,083 iTrader: 0 reviews	My headers and H are both BBK....the H doesnt match the headers worth shit lol its off width wise by about 3/4" lol __________________ True blue crew founder/member #1 378/442 rwhp/rwtqon a Mustang dyno cams are in..#'s coming this summer

January 17th, 2010, 01:35 AM	#16
Pittbull I Post Entirely Way Too Much 2001 Mustang GT If you're not first you're last Join Date: Sep 2009 Location: Rock Hill, SC Posts: 5,892 iTrader: 6 reviews	R u fukkin serious?! They r both bbk and they STILL don't fit? Haha dude that blows. I'd write a hate letter to BBKunts! __________________ Stock Rear Springs FOR SALE! PM Me Stock 99-04 GT Exhaust Manifolds FOR SALE! PM Me

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January 17th, 2010, 12:49 PM	#17
MikeJones Hardcore Enthusiast 2002 Mustang GT 13.7@103 Join Date: Jun 2009 Location: Stoon, Saskatchewan Posts: 2,913 iTrader: 0 reviews	slp says that a stock 03-04 cobra gains 25rwhp by just peplacing the catback. So yeash there is a difference. magnaflow says 8-15flywheel on there site. __________________ Mod6 Bigbore Kooks (parting out 2v motor) N/A 5.3 4v Build http://www.moddedmustangs.com/forums...ing-build.html Last edited by MikeJones; January 17th, 2010 at 01:39 PM.

January 17th, 2010, 01:24 PM	#20
ZenMGT Hardcore Enthusiast '02 GT 5spd Join Date: Oct 2009 Location: Boca Posts: 1,133 iTrader: 1 reviews	don't mean to threadjack,,,but assuming everything BUT my mufflers are stock (including the pipe after the mufflers to the tips) - if it's all stock, and I wanted to replace JUST the mufflers, I'd be looking for a muffler with 2.25" in and out correct? ('02 gt) __________________ boringly stock........but running well

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