Running straight pipe

lostcreek21 · 06-12-2003, 05:06 PM

Hey I was just wondering if there were any drawbacks to running a straight pipe without a muffler? Like gas mileage drop or power loss? Thanks

LIjeeperXJ · 06-12-2003, 05:39 PM

http://www.jeepsunlimited.com/forums...hreadid=395684

"Great solution: buy a cut-out. Anywhere in the exhaust you put a Y shaped pipe in, with a escape pipe. You can run your normal exhaust, or open the valve and have open pipes. Or you can open it half/quarter, for the sound/back pressure you want. Most have to be unscrewed from under the truck, but you can get cable operated, and electronic.

It's perfect, no one wants loud exhaust all the time, taking your gf out to dinner, or coming home late, it sucks. But when you're at a light with a buddy, you show him what is up with two words, straight pipes.

http://www.jcwhitney.com/product.jh...ID=5199&BQ=jcw2
http://dmhperfproducts.homestead.com/borlaplate.html

For searching online, they are also called Dump Pipes."

akxj · 06-12-2003, 08:15 PM

i ran no pipe from the cat back and it was definately loud as hell and most people dont really care, but i loved it and so did the chicks...so the hell with every one else...i talked to a exhaust shop and they said that i would be fine as long as i still had the cat on there for back pressure reasons and other exhaust lingo....i noticed a drop in gas mileage, but who cares it sounded pretty cool....if you don't wanna do that just put a cherry bomb on it....later, eric

lostcreek21 · 06-12-2003, 08:21 PM

Ya I bought a flowmaster 40 series delta flow and I'm getting it welded tonight but I took it off and drove the jeep around and I liked it without the muffler because the muffler doesn't sound too much louder than stock. Thanks

ryan86jeep · 06-12-2003, 09:57 PM

theoretically you should be getting better gas milage, cause it breathes easier....

but most of us will wamp on it more just to hear it... so their goes the gas mileage....

Superchannel · 06-12-2003, 10:33 PM

what are the benifets of straight pipe. i was lookign at the "dumb pipe" thing and it looked cool for my friends 66 mustang. would it get more power or just make it loud? what about in my jeep?

lostcreek21 · 06-12-2003, 10:42 PM

How do you reset the computer on my 4.0l in my 87 cherokee laredo. Thanks

ryan86jeep · 06-12-2003, 10:45 PM

you should get better top end... and better top end fuel econmy...

loss of low rpm torque is suspected, but if its a V motor, putting in an H pipe, or an X pipe will fix this to some extent...

and yes, louder it is...

RockinXJ · 06-13-2003, 02:50 AM

I ran mine with no cat and a flowmaster 40 series and did notice some top end gain, but the sound got annoying as hell and i got horrible gas mileage. Now that ive put a cat back on, its way quiter and doesnt seem to use nearly as much gas.

lostcreek21 · 06-13-2003, 05:03 AM

I still have my cat on. I just took off the muffler and connected a pipe. Will my gas mileage decrease or what?

Blue XJ · 06-13-2003, 11:09 AM

Quote:

-=- originally posted by lostcreek21 -=-
How do you reset the computer on my 4.0l in my 87 cherokee laredo. Thanks

To reset the computer you can jsut disconnect the battery for 15 minutes or so. Should do the trick for ya.

Fryphax · 06-14-2003, 12:28 AM

Im running a straight pipe into a glasspack, not horribly loud, no drone on the highway. And it sounds oh so good. After I cut my cat off I started it up...it sounds good but way to loud. Its perfect with the pipe and pack now though.

I did notice a loss of low end torque, but I can still chirp 33x12.50 A/Ts with stock gearing. Top end is much, much better now. Your results may differ.

lostcreek21 · 06-14-2003, 12:56 AM

Hey fryphax, is it one of those cherry bomb glasspacks. I have found many around here that are like 25 bucks and i'm thinking of that. Do you have your cat on right now with the glasspack? What about your gas mileage? Thanks

Big Bondi · 06-14-2003, 10:39 AM

http://www.jeepsunlimited.com/forums...hreadid=346180

opinions i got were "very gay" and "it would sound like a wet fart"

although i had a thought, what if you had the cutout go to a second exhaust pipe running a flowmaster 30. this way you could turn on and off the flowmaster sound, and with a little work on the tips it would look like a normal dual exhast setup

Fryphax · 06-14-2003, 04:06 PM

Quote:

-=- originally posted by lostcreek21 -=-
Hey fryphax, is it one of those cherry bomb glasspacks. I have found many around here that are like 25 bucks and i'm thinking of that. Do you have your cat on right now with the glasspack? What about your gas mileage? Thanks

Yup just a standard glasspack, some call them cherry bombs. Same thing really. I have a 2" glasspack with the ends expanded to 2 1/4 No cat, it was bad and rattled to I just put in a straight pipe. My gas milage stayed the same, but I also put on 33s when I put the pipe on. Plus Im a bit more aggresive just to hear my 4.0 Breathe

06-12-2003, 05:06 PM	#1
lostcreek21 Registered Join Date: Apr 2003 Location: Gresham, oregon Posts: 272 Thanks: 0 Thanked 0 Times in 0 Posts	Running straight pipe Hey I was just wondering if there were any drawbacks to running a straight pipe without a muffler? Like gas mileage drop or power loss? Thanks

06-12-2003, 05:39 PM	#2
LIjeeperXJ Registered Join Date: May 2003 Location: Eastern Long Island, NY Posts: 183 Thanks: 0 Thanked 0 Times in 0 Posts	http://www.jeepsunlimited.com/forums...hreadid=395684 "Great solution: buy a cut-out. Anywhere in the exhaust you put a Y shaped pipe in, with a escape pipe. You can run your normal exhaust, or open the valve and have open pipes. Or you can open it half/quarter, for the sound/back pressure you want. Most have to be unscrewed from under the truck, but you can get cable operated, and electronic. It's perfect, no one wants loud exhaust all the time, taking your gf out to dinner, or coming home late, it sucks. But when you're at a light with a buddy, you show him what is up with two words, straight pipes. http://www.jcwhitney.com/product.jh...ID=5199&BQ=jcw2 http://dmhperfproducts.homestead.com/borlaplate.html For searching online, they are also called Dump Pipes." __________________ 90 XJ, ~7", 35 SSRs

06-12-2003, 08:15 PM	#3
akxj Registered Join Date: Nov 2002 Location: Fairbanks, AK Posts: 410 Thanks: 0 Thanked 0 Times in 0 Posts	i ran no pipe from the cat back and it was definately loud as hell and most people dont really care, but i loved it and so did the chicks...so the hell with every one else...i talked to a exhaust shop and they said that i would be fine as long as i still had the cat on there for back pressure reasons and other exhaust lingo....i noticed a drop in gas mileage, but who cares it sounded pretty cool....if you don't wanna do that just put a cherry bomb on it....later, eric __________________ Eric Stoneking 99XJ Sport, 8.25in rustys long arm,4.56 w/ ARB rear and D30 ARB 30/30 kit front, borla headers, flowmaster catback, 35in BFG MT KM, Protofab front/rear bumpers, wilderness roof rack, bushsmacker flares, indiglo guages, AA SYE w/ Tom Wood's D/S, Optima yellow top,safari snorkel, Warn M8000 winch, rusty's motor mounts, SS brakelines, rusty's OTK steering conversion, and some other ****... www.arcticoffroad.com

06-12-2003, 09:57 PM	#5
ryan86jeep Registered Join Date: Dec 2002 Location: Hopewell, Nj Posts: 6,197 Thanks: 0 Thanked 20 Times in 20 Posts	theoretically you should be getting better gas milage, cause it breathes easier.... but most of us will wamp on it more just to hear it... so their goes the gas mileage.... __________________ .................................... 86' Cherokee.. 2.8L..3" lift, 256,000 miles original trans motor rears tc...~Electric fan... ~Custom Switch panel on glovebox..~Custom overhead console..~Rear auxilary lights.. 94' Grand Cherokee (DD)5.2L V8~242~Preformance ECU~Custom TurboCity Dual Intake W/ K&N Filters ~ML Headers~Custom Made Dynomax 3" Header-Back Exhaust ~3.5" RE~31's~5.9 E-Fan~UberRare Red 5.9hood :happpyd: ~RE adj. front trac bar~RE super flex adj. control arms ~Rear Tire Carier~Remote Start~MX6 Shocks Soundclip of my Exhaust (right click and save as) 89' Grand Wagoneer (Ours) 360 D44s FOR SALE, new motor 3k ago, rebuilt trans 9k ago My Webpage(in the making...still....)

06-12-2003, 10:45 PM	#8
ryan86jeep Registered Join Date: Dec 2002 Location: Hopewell, Nj Posts: 6,197 Thanks: 0 Thanked 20 Times in 20 Posts	you should get better top end... and better top end fuel econmy... loss of low rpm torque is suspected, but if its a V motor, putting in an H pipe, or an X pipe will fix this to some extent... and yes, louder it is... __________________ .................................... 86' Cherokee.. 2.8L..3" lift, 256,000 miles original trans motor rears tc...~Electric fan... ~Custom Switch panel on glovebox..~Custom overhead console..~Rear auxilary lights.. 94' Grand Cherokee (DD)5.2L V8~242~Preformance ECU~Custom TurboCity Dual Intake W/ K&N Filters ~ML Headers~Custom Made Dynomax 3" Header-Back Exhaust ~3.5" RE~31's~5.9 E-Fan~UberRare Red 5.9hood :happpyd: ~RE adj. front trac bar~RE super flex adj. control arms ~Rear Tire Carier~Remote Start~MX6 Shocks Soundclip of my Exhaust (right click and save as) 89' Grand Wagoneer (Ours) 360 D44s FOR SALE, new motor 3k ago, rebuilt trans 9k ago My Webpage(in the making...still....)

06-12-2003, 08:21 PM	#4
lostcreek21 Registered Join Date: Apr 2003 Location: Gresham, oregon Posts: 272 Thanks: 0 Thanked 0 Times in 0 Posts	Ya I bought a flowmaster 40 series delta flow and I'm getting it welded tonight but I took it off and drove the jeep around and I liked it without the muffler because the muffler doesn't sound too much louder than stock. Thanks

06-12-2003, 10:33 PM	#6
Superchannel Registered Join Date: Jan 2003 Posts: 130 Thanks: 0 Thanked 0 Times in 0 Posts	what are the benifets of straight pipe. i was lookign at the "dumb pipe" thing and it looked cool for my friends 66 mustang. would it get more power or just make it loud? what about in my jeep?

06-12-2003, 10:42 PM	#7
lostcreek21 Registered Join Date: Apr 2003 Location: Gresham, oregon Posts: 272 Thanks: 0 Thanked 0 Times in 0 Posts	How do you reset the computer on my 4.0l in my 87 cherokee laredo. Thanks

06-13-2003, 02:50 AM	#9
RockinXJ Registered Join Date: Sep 2002 Location: OKC, OK Posts: 475 Thanks: 0 Thanked 0 Times in 0 Posts	I ran mine with no cat and a flowmaster 40 series and did notice some top end gain, but the sound got annoying as hell and i got horrible gas mileage. Now that ive put a cat back on, its way quiter and doesnt seem to use nearly as much gas. __________________

06-13-2003, 05:03 AM	#10
lostcreek21 Registered Join Date: Apr 2003 Location: Gresham, oregon Posts: 272 Thanks: 0 Thanked 0 Times in 0 Posts	I still have my cat on. I just took off the muffler and connected a pipe. Will my gas mileage decrease or what?

06-14-2003, 12:28 AM	#12
Fryphax Registered Join Date: Mar 2003 Location: Ishpeming, MI Posts: 321 Thanks: 0 Thanked 0 Times in 0 Posts	Im running a straight pipe into a glasspack, not horribly loud, no drone on the highway. And it sounds oh so good. After I cut my cat off I started it up...it sounds good but way to loud. Its perfect with the pipe and pack now though. I did notice a loss of low end torque, but I can still chirp 33x12.50 A/Ts with stock gearing. Top end is much, much better now. Your results may differ. __________________ Four Headlight Jeep Club Member #1 1990 Cherokee Limited - Parting out 1987 Wagoneer....Wood love baby! Currently a body on jackstands. Awaiting new suspension, 38.5x14.50 SXs and D60s F/R

06-14-2003, 12:56 AM	#13
lostcreek21 Registered Join Date: Apr 2003 Location: Gresham, oregon Posts: 272 Thanks: 0 Thanked 0 Times in 0 Posts	Hey fryphax, is it one of those cherry bomb glasspacks. I have found many around here that are like 25 bucks and i'm thinking of that. Do you have your cat on right now with the glasspack? What about your gas mileage? Thanks

06-14-2003, 10:39 AM	#14
Big Bondi Registered Join Date: Aug 2002 Location: Amherst (Buffalo), NY Posts: 1,844 Thanks: 0 Thanked 0 Times in 0 Posts	http://www.jeepsunlimited.com/forums...hreadid=346180 opinions i got were "very gay" and "it would sound like a wet fart" although i had a thought, what if you had the cutout go to a second exhaust pipe running a flowmaster 30. this way you could turn on and off the flowmaster sound, and with a little work on the tips it would look like a normal dual exhast setup __________________ -Craig [GLOW=red]i have no jeep...[/GLOW]

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