Exhaust Question

1sl0w88 · July 7th, 2008, 10:48 AM

Hey Guys!

Its time to replace the exhaust in my 88 convertible. I was thinking of going with a set of equal length shorty headers, off-road h-pipe and turn downs instead of going all the way out the back. In doing this is there any kind of issues that I need to be concerned with? The car is Speed Density and bone stock except for under-drive pulleys and the smog pump being by-passed.

Smirnoff · July 7th, 2008, 11:08 AM

you shouldnt see any problems with that setup

1sl0w88 · July 7th, 2008, 02:26 PM

Good! I was just wondering if there would be any problems without the cats.

nolife · July 7th, 2008, 02:41 PM

You mean turn downs after the mufflers? Either way, it is loud and you will have some exhaust smell in the car.

Smirnoff · July 7th, 2008, 02:45 PM

Originally Posted by ponylvr2

Good! I was just wondering if there would be any problems without the cats.

nope you dont have any sensors after the cats

and my exhaust is dumped after my muffs and i dont really get any exhaust smell in my car, its just a smidge louder inside than with exits

1sl0w88 · July 7th, 2008, 04:45 PM

What about the current sensors? I wont be able to hook them up with the h-pipe so what do I do about them?

91cobra5.0 · July 7th, 2008, 04:50 PM

your gona have to run some type of muffler, its loud as all hell without cats, i just recently did mine and tried to run without mufflers and it was too loud, like get pulled over within 5 blocks loud

1sl0w88 · July 7th, 2008, 04:59 PM

Im sorry. I didnt make that clear. I meant turndowns after the mufflers.

fogged306 · July 8th, 2008, 01:26 AM

Originally Posted by ponylvr2

What about the current sensors? I wont be able to hook them up with the h-pipe so what do I do about them?

If you're talking about the o2 sensors, there will be bungs welded into the h-pipe for them, you just re-install them just like they were.

89lxroadburner · July 9th, 2008, 07:10 PM

i run offroad pypes set-up on mine with a x-over & i have had no problems...actually i dont think i have it in me to put cats on...lol

1sl0w88 · July 10th, 2008, 08:50 AM

Thnx for the help. I just didnt want to run into any more problems than necessary!

1slo5.0 · July 10th, 2008, 09:08 AM

No tailpipes is alot louder inside and outside of the car no matter what muffler you use. Not to mention the exhaust gasses that will be inside the car on a daily driven vehicle. No tailpipes has absolutely no performance benefit so why do it? If you want a performance increase take the entire exhaust system off. Quiet cars that are fast are cool.

1sl0w88 · July 10th, 2008, 01:11 PM

Yeah, I agree about it being louder inside the car. I guess my question was really more about the o2 sensors if I put an after market h-pipe on it. I just have to watch my cash flow right now. Several other things need attention too. The trans just started to grind a little going into 2nd if the rpm's are up and I deff have a broke ring or two in the #8 cylinder. I have an extension on the plug to keep it from fouling out. Uses way too much oil. But, I still have plenty of power and get good gas mileage. 20 to 21 mpg.

1slo5.0 · July 10th, 2008, 02:04 PM

Originally Posted by ponylvr2

Yeah, I agree about it being louder inside the car. I guess my question was really more about the o2 sensors if I put an after market h-pipe on it. I just have to watch my cash flow right now. Several other things need attention too. The trans just started to grind a little going into 2nd if the rpm's are up and I deff have a broke ring or two in the #8 cylinder. I have an extension on the plug to keep it from fouling out. Uses way too much oil. But, I still have plenty of power and get good gas mileage. 20 to 21 mpg.

The oil consumption is probably valve guides or valve seals.

1sl0w88 · July 10th, 2008, 02:11 PM

Seals have been replaced. The reason I say cracked rings is bacause the plug in #8 gets covered in oil. But this could be caused by the guides?

1slo5.0 · July 10th, 2008, 02:32 PM

Originally Posted by ponylvr2

Seals have been replaced. The reason I say cracked rings is bacause the plug in #8 gets covered in oil. But this could be caused by the guides?

Bad guides or seals will cover the plug in oil as well. I had an 88 GT that was like that. Once I rebuild the heads everything was fine. Oil drains back thru the heads so it has a direct path to the cylinder if there is an area to leak thru. Sounds like a good reason to put some Twisted Wedge heads on it

Hunt_chevs · July 10th, 2008, 02:36 PM

Sometimes my eyes water a little bit from the exhaust in my car,. i aint gonna lie i kinda like it.. i have bbk equals, bbk o/r H, and flows with dumps,... beastly and it sounds purdy

nolife · July 10th, 2008, 04:38 PM

I ran dumps after flows for a while, I got sick of the loud and smell (and I have cats and full emissions). I am back to full exhaust now. Sounds really good outside the car and when i get on it but after about 10 years of Flowmasters on my Mustangs, I think I've finally had enough of the drone.

July 7th, 2008, 10:48 AM	#1
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	Exhaust Question Hey Guys! Its time to replace the exhaust in my 88 convertible. I was thinking of going with a set of equal length shorty headers, off-road h-pipe and turn downs instead of going all the way out the back. In doing this is there any kind of issues that I need to be concerned with? The car is Speed Density and bone stock except for under-drive pulleys and the smog pump being by-passed. __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 7th, 2008, 02:26 PM	#3
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	Good! I was just wondering if there would be any problems without the cats. __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 7th, 2008, 02:41 PM	#4
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	You mean turn downs after the mufflers? Either way, it is loud and you will have some exhaust smell in the car. __________________

July 7th, 2008, 04:45 PM	#6
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	What about the current sensors? I wont be able to hook them up with the h-pipe so what do I do about them? __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 10th, 2008, 08:50 AM	#11
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	Thnx for the help. I just didnt want to run into any more problems than necessary! __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 7th, 2008, 11:08 AM	#2
Smirnoff Enthusiast 1982 GT t-top no proof of purchase Join Date: May 2008 Location: N.E.PA Posts: 717 iTrader: 0 reviews	you shouldnt see any problems with that setup

July 7th, 2008, 04:50 PM	#7
91cobra5.0 Hardcore Enthusiast 98 Cobra Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,057 iTrader: 0 reviews	your gona have to run some type of muffler, its loud as all hell without cats, i just recently did mine and tried to run without mufflers and it was too loud, like get pulled over within 5 blocks loud

July 7th, 2008, 04:59 PM	#8
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	Im sorry. I didnt make that clear. I meant turndowns after the mufflers. __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 9th, 2008, 07:10 PM	#10
89lxroadburner Newbie 1989 ford mustang lx 5.0 lets find out? Join Date: Jul 2008 Location: Chesapeake, VA Posts: 7 iTrader: 0 reviews	i run offroad pypes set-up on mine with a x-over & i have had no problems...actually i dont think i have it in me to put cats on...lol

July 10th, 2008, 09:08 AM	#12
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	No tailpipes is alot louder inside and outside of the car no matter what muffler you use. Not to mention the exhaust gasses that will be inside the car on a daily driven vehicle. No tailpipes has absolutely no performance benefit so why do it? If you want a performance increase take the entire exhaust system off. Quiet cars that are fast are cool. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

July 10th, 2008, 01:11 PM	#13
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	Yeah, I agree about it being louder inside the car. I guess my question was really more about the o2 sensors if I put an after market h-pipe on it. I just have to watch my cash flow right now. Several other things need attention too. The trans just started to grind a little going into 2nd if the rpm's are up and I deff have a broke ring or two in the #8 cylinder. I have an extension on the plug to keep it from fouling out. Uses way too much oil. But, I still have plenty of power and get good gas mileage. 20 to 21 mpg. __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 10th, 2008, 02:11 PM	#15
1sl0w88 Regular 88 LX 5.0 Convertable Join Date: Jun 2008 Location: South Carolina Posts: 482 iTrader: 0 reviews	Seals have been replaced. The reason I say cracked rings is bacause the plug in #8 gets covered in oil. But this could be caused by the guides? __________________ Robbie _________________ 88 LX Convertible 5.0 84 GT - Project 66 F100

July 10th, 2008, 02:36 PM	#17
Hunt_chevs Hardcore Enthusiast 2002 Gt Not Slow Join Date: Aug 2007 Location: SJ-CA, 50-ft elev. Posts: 1,649 iTrader: 1 reviews	Sometimes my eyes water a little bit from the exhaust in my car,. i aint gonna lie i kinda like it.. i have bbk equals, bbk o/r H, and flows with dumps,... beastly and it sounds purdy

July 10th, 2008, 04:38 PM	#18
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	I ran dumps after flows for a while, I got sick of the loud and smell (and I have cats and full emissions). I am back to full exhaust now. Sounds really good outside the car and when i get on it but after about 10 years of Flowmasters on my Mustangs, I think I've finally had enough of the drone. __________________

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