exhaust question (not a common one)

modded232 · April 18th, 2008, 01:36 PM

I just installed my replacement exhaust manifold (passenger side) and my mac o/r h-pipe and mac catback. I was surprised how good it sounded at idle compared to my previous set-up (Jones Full Boar muffler welded in). But... it sounds absolutely horrible past 3k rpm! Would installing a couple high-flow cats help to keep the rasp down, or is there any way to lessen it, or will it lessen as my mufflers are broken in?

On a side note, the passenger side manifold did not fix my exhaust leak. The previous manifold was cracked, but I still have a leak coming from somewhere on that side. I plan on seafoaming it when I can get a couple friends to keep an eye on different parts of the exhaust to look for sources of leaks, but does anyone have any ideas where the leak could be coming from? I'm thinking manifold to midpipe or egr (i couldn't tighten it more than finger tight + a little).

Thanks.

whitemustang02 · April 18th, 2008, 01:39 PM

yes cat's will help the sound
but it still woun't sound all that good on the top end. mine starts to sound bad about 4500

shadow5403 · April 18th, 2008, 01:40 PM

was the header gasket changed? Check the collector too. I fyou get HF cats, yes it will take the rasp away.

94v6blkndred · April 18th, 2008, 01:40 PM

high flow cats should take some rasp out...i didnt think H pipes were supposed to be too raspy as is...as for the leak...im not sure....seaforming will definately help ya there...sucks you replaced the manifold and still got a leak!

shadow5403 · April 18th, 2008, 01:42 PM

h-pipe arent raspy....but its the fact that he has no cats with stock manifolds.

ESG-642T · April 18th, 2008, 01:46 PM

mac is raspy either way!

GreenFaleen · April 18th, 2008, 01:57 PM

cats will help if your desperate weld in a resonator

rob3980 · April 18th, 2008, 02:36 PM

I thought the same thing I just installed Mac Lt headers Mac o/r H-pipe with Magnaflow exhaust and its sounds good till you hit 3000rpms then it def sound like a ricer!

GreenFaleen · April 18th, 2008, 02:40 PM

what makes you think you have an exhaust leak anyway

Dansby · April 18th, 2008, 03:29 PM

That was my next question. Could just be the way the exhaust sounds.

modded232 · April 18th, 2008, 03:40 PM

Originally Posted by shadow5403

was the header gasket changed? Check the collector too. I fyou get HF cats, yes it will take the rasp away.

Yes, I got a brand new gasket, and since it is an OE style replacement there is no 3-to-1 collector like headers have. I looked over all the welds before I put it on, and it seemed to be fine.

Originally Posted by GreenFaleen

what makes you think you have an exhaust leak anyway

Started it up and had some smoke coming out of engine bay, smelled it and it was definitely exhaust. Loosened everything, and adjusted the manifold-to-midpipe joint so it was at the smallest angle I could get it, and tightened it, but there is still some smell and noise when driving (the ticking is gone, but there is still some noise, making me think it is further from the cylinder head, and closer to the manifold-midpipe joint or the egr connection). I'm no mechanic though.

GreenFaleen · April 18th, 2008, 03:44 PM

well smoke is normal on new manifolds mine smoked for about a week it is oil burning off it.
Do you have a tuner?

modded232 · April 18th, 2008, 03:44 PM

Originally Posted by GreenFaleen

well smoke is normal on new manifolds mine smoked for about a week it is oil burning off it.
Do you have a tuner?

I wish.

GreenFaleen · April 18th, 2008, 03:49 PM

Originally Posted by modded232

I wish.

ok cause I had what sounded like an exhaust leak and it was spark knock from the tuner. get some seafoam and find the leak is your best bet

modded232 · April 18th, 2008, 05:19 PM

Originally Posted by GreenFaleen

ok cause I had what sounded like an exhaust leak and it was spark knock from the tuner. get some seafoam and find the leak is your best bet

Will do. Thanks for the help.

April 18th, 2008, 01:36 PM	#1
modded232 Regular 2000 Mustang V6 Vert Join Date: Feb 2007 Location: Winnipeg, Canada Posts: 218 iTrader: 0 reviews	exhaust question (not a common one) I just installed my replacement exhaust manifold (passenger side) and my mac o/r h-pipe and mac catback. I was surprised how good it sounded at idle compared to my previous set-up (Jones Full Boar muffler welded in). But... it sounds absolutely horrible past 3k rpm! Would installing a couple high-flow cats help to keep the rasp down, or is there any way to lessen it, or will it lessen as my mufflers are broken in? On a side note, the passenger side manifold did not fix my exhaust leak. The previous manifold was cracked, but I still have a leak coming from somewhere on that side. I plan on seafoaming it when I can get a couple friends to keep an eye on different parts of the exhaust to look for sources of leaks, but does anyone have any ideas where the leak could be coming from? I'm thinking manifold to midpipe or egr (i couldn't tighten it more than finger tight + a little). Thanks.

April 18th, 2008, 01:39 PM	#2
whitemustang02 MM's official Chevy guy 2002 Mustang V6 Join Date: Sep 2007 Location: Rochester, NY Posts: 2,024 iTrader: 0 reviews	yes cat's will help the sound but it still woun't sound all that good on the top end. mine starts to sound bad about 4500 __________________ "Speak softly and carry a big stick" - Theodore Roosevelt "Any idiot can make a V8 fast, it takes a real idiot to make a fast V6". '02 Mustang N/A 4.3 stroker away for winter '72 Chevelle project car 454 coming '93 Bronco EFI 351W DD

April 18th, 2008, 01:40 PM	#3
shadow5403 Hardcore Enthusiast Join Date: Oct 2007 Location: PA Posts: 2,037 iTrader: 0 reviews	was the header gasket changed? Check the collector too. I fyou get HF cats, yes it will take the rasp away. __________________

April 18th, 2008, 01:42 PM	#5
shadow5403 Hardcore Enthusiast Join Date: Oct 2007 Location: PA Posts: 2,037 iTrader: 0 reviews	h-pipe arent raspy....but its the fact that he has no cats with stock manifolds. __________________

April 18th, 2008, 01:46 PM	#6
ESG-642T [8MINUS2] 2002, Ford, v6 Join Date: Feb 2007 Location: TEXAS Posts: 12,319 iTrader: 0 reviews	mac is raspy either way! __________________ Hi, You can call me Kyle Random ESG fact: Had a prochamber on his v6 before it was popular. WTB: v6 BBK valve covers

April 18th, 2008, 01:40 PM	#4
94v6blkndred Hardcore Enthusiast 02 Turboed Saleen Clone faster than my v6 Join Date: Mar 2007 Location: Houston, TX Posts: 1,604 iTrader: 0 reviews	high flow cats should take some rasp out...i didnt think H pipes were supposed to be too raspy as is...as for the leak...im not sure....seaforming will definately help ya there...sucks you replaced the manifold and still got a leak!

April 18th, 2008, 01:57 PM	#7
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,880 Blog Entries: 2 iTrader: 1 reviews	cats will help if your desperate weld in a resonator __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

April 18th, 2008, 02:36 PM	#8
rob3980 Regular 2004 Mustang 3.9L Join Date: Apr 2008 Location: Wisconsin Posts: 73 iTrader: 0 reviews	I thought the same thing I just installed Mac Lt headers Mac o/r H-pipe with Magnaflow exhaust and its sounds good till you hit 3000rpms then it def sound like a ricer!

April 18th, 2008, 02:40 PM	#9
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,880 Blog Entries: 2 iTrader: 1 reviews	what makes you think you have an exhaust leak anyway __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

April 18th, 2008, 03:29 PM	#10
Dansby Hardcore Enthusiast Join Date: Mar 2007 Location: Orange, Texas Posts: 2,285 iTrader: 1 reviews	That was my next question. Could just be the way the exhaust sounds.

April 18th, 2008, 03:44 PM	#12
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,880 Blog Entries: 2 iTrader: 1 reviews	well smoke is normal on new manifolds mine smoked for about a week it is oil burning off it. Do you have a tuner? __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

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