To have or not to have....that is the question

cyberstang5.0 · 12-10-2001, 01:55 PM

I currently have a 1 5/8" unequl headers, 2 1/2" h-pipe with hi-flow cats, and 3 chamber mufflers with 2 1/2" chrome tips all from MAC. The quesiton is how much of a HP gain is the off-road H-pipe then the H-pipe with the Hi-flow cats? How much louder will it make my car? Will I still pass emission tests?

My friend had (before he moved) the same exhaust system as me except for he had the off-road H-pipe. His car sounded quieter for some reason

He also had emissions hook ups and he could get away with it. If need be, I will swap the H-pipe when the time comes to get it inspected and then swap it back to the off road. I like loud cars and my car is LOUD but I live in a quiet neighborhood so I have to keep it undercontrol.

92Rustang · 12-10-2001, 02:02 PM

I don't think there is that much difference with cats or with out. You might be losing a little HP with the cats,but not a noticeable one. The biggest difference is ths size of the pipe, which you already have.

HiFlow5 0 · 12-10-2001, 04:51 PM

i know when i swap from my mac off road H pipe to my one with cats for emissions i can notice a difference. the exhaust is not as throaty and kinda dull. there is also a slight heisitation in acceleration. if you were thinking of a mac H pipe i would get a pro chamber, i have heard good things about them.

12-10-2001, 01:55 PM	#1
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	To have or not to have....that is the question I currently have a 1 5/8" unequl headers, 2 1/2" h-pipe with hi-flow cats, and 3 chamber mufflers with 2 1/2" chrome tips all from MAC. The quesiton is how much of a HP gain is the off-road H-pipe then the H-pipe with the Hi-flow cats? How much louder will it make my car? Will I still pass emission tests? My friend had (before he moved) the same exhaust system as me except for he had the off-road H-pipe. His car sounded quieter for some reason He also had emissions hook ups and he could get away with it. If need be, I will swap the H-pipe when the time comes to get it inspected and then swap it back to the off road. I like loud cars and my car is LOUD but I live in a quiet neighborhood so I have to keep it undercontrol.

12-10-2001, 02:02 PM	#2
92Rustang Registered Member Join Date: Feb 1999 Location: Smithton, IL, US Posts: 215	I don't think there is that much difference with cats or with out. You might be losing a little HP with the cats,but not a noticeable one. The biggest difference is ths size of the pipe, which you already have. __________________ 92 GT 5-speed Windsor Jr,E303,1.7RR,Cobra intake,65mm TB,155lph,24 lbs,75mm MAS,shorties,h-pipe, 2.5 flowmaster,Black magic,Holley adj fuel, 3.73 No times yet. 13.6 before heads,cam,inj,rr www.fordmustanggt.com

12-10-2001, 04:51 PM	#3
HiFlow5 0 Registered Member Join Date: Mar 2000 Location: Springfield, Ma, usa Posts: 706	i know when i swap from my mac off road H pipe to my one with cats for emissions i can notice a difference. the exhaust is not as throaty and kinda dull. there is also a slight heisitation in acceleration. if you were thinking of a mac H pipe i would get a pro chamber, i have heard good things about them. __________________ NewEngland Auto www.baystategearheads.com -91 Mustang Coupe, ex 4cyl (sold) -99 F150, 3" lift, 35" Procomps, Magnaflow exhaust

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