exhaust question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steppside69 · 06-20-2004, 01:50 PM

I recently put 3 in. exhaust on my truck and was wondering if I should put a cross over pipe (h-pipe) in?
I heard you get better sound and less back pressure. Is that true? What kind of prerks will you get connecting the 2 exhaust pipes?
thanks and Happy Father's Day to all the Dads out there

steppside69

thisolechevy · 06-20-2004, 02:02 PM

It is also called an "X" pipe and they really help!! You will get loads better sound from the pipes, and less back pressure. Perks I am not sure other what than I what I already said.

**smitty62** · 06-20-2004, 02:42 PM

My experience is the sound is better (but louder) without the pipe--performance may improve slightly with it..........don't expect miracles!

crazy longhorn · 06-20-2004, 07:53 PM

An H or X pipe will mellow the exhaust note a tad, & give a more "tuned" sound. They do help with low/ mid range tork, without affecting top end. Also said to help fuel milage......Dunno on that one(leadfoot

). i have run an H pipe on any perf app that i have run over the last 20yrs, 7 wouldnt go any other way

crazyL

69 Short Fleet · 06-20-2004, 08:52 PM

I just got my enine running @ 1 hour ago after the shop put a new 2 1/2" aluminized pipe into a "X System" then into a pair of Proflow mufflers and from there above the rear axle and straight out the back (into stainless steel tips). Man I am IMPRESSED!!!! It sounds really nice and smooth. I was going to put a cheapo exhaust on and upgrade it after... and I'm REALLY glad I chose to spend the extra $$$ on it now! Regards Doug

walker · 06-21-2004, 12:41 AM

Read a post a while back about this, and it made a lot of sense to me. All SBC's are balances internally, through the manifold, and therefor don't need an H pipe. Anyone has any legitimate Dyno info to prove it wrong I'd sure like to see it.

crazy longhorn · 06-21-2004, 08:52 AM

My combo does have the heat passage in the intake, nut not in the heads(Edelbrock rpm). Many of the aftermarket heads do not have the heat passage. As far as dyno info to dispute that claim, I dont have any.....I will say that i have run several sb chevs with stock intake & heads, & the H pipe does help

1 that I saw a dramatic diff on was a 327 in an old flatbed, with 305 heads on (to up the compression). this was a heavy truck, with 4.10 gears, & a fairly big cam for the app. the addition of that H pipe made a very noticeable difference in the pulling power in the lower end.....it made a beleiver out of this old man! crazyL

68w/sbc406 · 06-21-2004, 01:23 PM

when i went and got my exhaust done, they said there wasnt room for a "x" pipe, so i went with a "H" pipe. do some of you guys have an "X" on your ride?

jimfulco · 06-22-2004, 01:39 AM

The crossover in the intake is not very big, & with headers it only affects 2 cylinders.

Here's a test of X- vs. H-pipes:

http://pontiacstreetperformance.com/psp/exhaust3.html

06-20-2004, 01:50 PM	#1
steppside69 Registered User Join Date: Apr 2004 Location: Rossford,Ohio Posts: 291	exhaust question I recently put 3 in. exhaust on my truck and was wondering if I should put a cross over pipe (h-pipe) in? I heard you get better sound and less back pressure. Is that true? What kind of prerks will you get connecting the 2 exhaust pipes? thanks and Happy Father's Day to all the Dads out there steppside69 __________________ 69 chevy stepside (project) 2006 Silverado Z71 Ext. cab 2005 Saturn VUE (wifes dd)

06-20-2004, 02:02 PM	#2
thisolechevy Registered User Join Date: Jun 2004 Location: Gainesville, Fl Posts: 382	It is also called an "X" pipe and they really help!! You will get loads better sound from the pipes, and less back pressure. Perks I am not sure other what than I what I already said. __________________ Man I need another 67-72!!!

06-20-2004, 02:42 PM	#3
smitty62 Registered User Join Date: May 2002 Location: North Carolina Posts: 1,234	My experience is the sound is better (but louder) without the pipe--performance may improve slightly with it..........don't expect miracles! __________________ Stepsides look like real trucks! Smitty

06-20-2004, 07:53 PM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	An H or X pipe will mellow the exhaust note a tad, & give a more "tuned" sound. They do help with low/ mid range tork, without affecting top end. Also said to help fuel milage......Dunno on that one(leadfoot ). i have run an H pipe on any perf app that i have run over the last 20yrs, 7 wouldnt go any other way crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

06-21-2004, 12:41 AM	#6
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	Read a post a while back about this, and it made a lot of sense to me. All SBC's are balances internally, through the manifold, and therefor don't need an H pipe. Anyone has any legitimate Dyno info to prove it wrong I'd sure like to see it. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

06-20-2004, 08:52 PM	#5
69 Short Fleet Registered User Join Date: Nov 2002 Location: Kelowna B.C. Canada Posts: 1,086	I just got my enine running @ 1 hour ago after the shop put a new 2 1/2" aluminized pipe into a "X System" then into a pair of Proflow mufflers and from there above the rear axle and straight out the back (into stainless steel tips). Man I am IMPRESSED!!!! It sounds really nice and smooth. I was going to put a cheapo exhaust on and upgrade it after... and I'm REALLY glad I chose to spend the extra $$$ on it now! Regards Doug

06-21-2004, 08:52 AM	#7
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	My combo does have the heat passage in the intake, nut not in the heads(Edelbrock rpm). Many of the aftermarket heads do not have the heat passage. As far as dyno info to dispute that claim, I dont have any.....I will say that i have run several sb chevs with stock intake & heads, & the H pipe does help 1 that I saw a dramatic diff on was a 327 in an old flatbed, with 305 heads on (to up the compression). this was a heavy truck, with 4.10 gears, & a fairly big cam for the app. the addition of that H pipe made a very noticeable difference in the pulling power in the lower end.....it made a beleiver out of this old man! crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

06-21-2004, 01:23 PM	#8
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	when i went and got my exhaust done, they said there wasnt room for a "x" pipe, so i went with a "H" pipe. do some of you guys have an "X" on your ride? __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

06-22-2004, 01:39 AM	#9
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	The crossover in the intake is not very big, & with headers it only affects 2 cylinders. Here's a test of X- vs. H-pipes: http://pontiacstreetperformance.com/psp/exhaust3.html



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