H-pipe question

blk88lx · 01-22-2002, 01:40 PM

Hi all,

I'm in the process of purchasing a 93 GT. I have a friend that has the exact same car. He took the stock H-pipe and hollowed out the cats. Now, I would never do this as this would be breaking this states pollution control laws. If I was to use a set-up like it I would only run it at the track. I was just curious as to how the hollowed out cats will effect his O2 sensors? I have also not heard his car run with the hollowed H-pipe. Would it be way to loud?

Jayson

ALS85GT · 01-22-2002, 02:00 PM

Well I don't know about the sensors but it would definately be louder. I did the same thing in an 85 I had.

95mustanggt · 01-22-2002, 02:59 PM

Well I'd predict they would react the same way my 95GT did when I completely removed the Cats and left the sensors alone: The car had more power and sounded way cooler!

joe4speed · 01-22-2002, 05:37 PM

Go for it!! Before we got rid of the emissions laws here in FL! (a great day that was!!) Everyone just ran off-roads and hollowed out cats all year till they had to do emissions, then they put the cats on for inspection. I had no problems with O2 sensors, and neither did anyone I know.

ALS85GT · 01-22-2002, 05:51 PM

JL1314, the fumes more noticable?

chatcher · 01-22-2002, 06:20 PM

summit sells a less restrictive h-pipe with cats in it that it claims is still emissions legal personaly id just get a regular off road h-pipe i like the sound of thexhaust note of the straight h combined with some flowmasters just swap it out come test time i cant think of anyone that hasnt cheated on at least one test in their life

95mustanggt · 01-22-2002, 06:31 PM

You can smell my car more. Especially if you are in an enclosed area (not inside, just where the air doesn't move).

01-22-2002, 01:40 PM	#1
blk88lx Registered Member Join Date: Jun 2001 Location: Fort Leonard Wood, MO Posts: 179	H-pipe question Hi all, I'm in the process of purchasing a 93 GT. I have a friend that has the exact same car. He took the stock H-pipe and hollowed out the cats. Now, I would never do this as this would be breaking this states pollution control laws. If I was to use a set-up like it I would only run it at the track. I was just curious as to how the hollowed out cats will effect his O2 sensors? I have also not heard his car run with the hollowed H-pipe. Would it be way to loud? Jayson

01-22-2002, 02:00 PM	#2
ALS85GT Registered Member Join Date: Aug 2001 Location: Miami, Fl, USA Posts: 69	Well I don't know about the sensors but it would definately be louder. I did the same thing in an 85 I had. __________________ 85GT 5.0 was CFI converted to Holley 650. Hooker full length headers, FlowMaster 2 chamber. Weiand Stealth manifold. 86 roller motor, crane 1:7:1 alum rocker arms(roller). SSI 220@.050/498 Roller cam. Summit double roller timing chain. Melling oil pump, stock bottom end. Mallory Hi-Fire ignition. Under drive pulleys. Accell coil and Ford Motorsport 9mm wires. 93'8.8 posi. 4:10s. AOD w/B&M shift kit. No figures yet, still working on it. No back seats or AC. 1989 GT Convert-- All stock w/AOD, Air Silencer removed, DynoMax Mufflers.

01-22-2002, 02:59 PM	#3
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	Well I'd predict they would react the same way my 95GT did when I completely removed the Cats and left the sensors alone: The car had more power and sounded way cooler! __________________ 1995 Mustang GT 20016 F150 Lariat Super Crew

01-22-2002, 05:37 PM	#4
joe4speed He said Member...heh, heh Join Date: Sep 1999 Location: Jupiter, Florida U.S.A. Posts: 3,718	Go for it!! Before we got rid of the emissions laws here in FL! (a great day that was!!) Everyone just ran off-roads and hollowed out cats all year till they had to do emissions, then they put the cats on for inspection. I had no problems with O2 sensors, and neither did anyone I know. __________________ *Joe!* 1988 GT, 13.58@101mph Check out my listing! Click here! Or my website:www.joe4speed.com

01-22-2002, 05:51 PM	#5
ALS85GT Registered Member Join Date: Aug 2001 Location: Miami, Fl, USA Posts: 69	JL1314, the fumes more noticable? __________________ 85GT 5.0 was CFI converted to Holley 650. Hooker full length headers, FlowMaster 2 chamber. Weiand Stealth manifold. 86 roller motor, crane 1:7:1 alum rocker arms(roller). SSI 220@.050/498 Roller cam. Summit double roller timing chain. Melling oil pump, stock bottom end. Mallory Hi-Fire ignition. Under drive pulleys. Accell coil and Ford Motorsport 9mm wires. 93'8.8 posi. 4:10s. AOD w/B&M shift kit. No figures yet, still working on it. No back seats or AC. 1989 GT Convert-- All stock w/AOD, Air Silencer removed, DynoMax Mufflers.

01-22-2002, 06:20 PM	#6
chatcher Registered Member Join Date: Jun 2001 Location: butler pa Posts: 303	summit sells a less restrictive h-pipe with cats in it that it claims is still emissions legal personaly id just get a regular off road h-pipe i like the sound of thexhaust note of the straight h combined with some flowmasters just swap it out come test time i cant think of anyone that hasnt cheated on at least one test in their life __________________ 92lx wannabe saleen

01-22-2002, 06:31 PM	#7
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	You can smell my car more. Especially if you are in an enclosed area (not inside, just where the air doesn't move). __________________ 1995 Mustang GT 20016 F150 Lariat Super Crew

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