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06-08-2002, 05:53 PM
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#1
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Registered User
Join Date: May 2001
Location: Downers Grove, Illinois
Posts: 853
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Slp loudmouth and straight pipe..Will that wear out the valves?
my friend told me that having the slp loudmouth exhaust or straight pipe on the Ls1 will wear out the engine valves faster..Is that true? will this type of exhaust cause the valves to to wear out and weaken? any comments?
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06-08-2002, 10:00 PM
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#2
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Registered User
Join Date: Jun 1999
Location: OR
Posts: 2,374
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no
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06-08-2002, 11:12 PM
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#3
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Registered User
Join Date: Apr 2001
Location: Greenville SC USA
Posts: 1,763
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Yea thats like a wives tell. Im not sure why all the "back in the day" drag racers say this. I have heard it by so many people too. Truth is theres been tons of guys running straight headers or just straight pipes for years with no problems.
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Rob Jenkins
-95 M6 Trans Am-
Mods: Hooker Longtubes, CSI electric waterpump, Flowtech 3in cutout, Grenatelli MAF, 1LE intake Bellow, Flowmaster exhaust, 17x9 Niche Rims, Homemade CAI, Homemade Ram Air scoop, TB bypass, 1LE elbow, NGK TR55's, Taylor Plug wires.
-Best G-Tech times-
13.30 @ 110mph lots-o-wheelspin (G-Tech is a little high on MPH's I would be happy with a 104-5mph trap) I know I need some real Track times 
1/8 mile track time:
8.435 @ 84.3mph with a 2.0 60ft
http://www.fortunecity.com/silversto...9/13140800.jpg
http://www.fortunecity.com/silverstone/renault/219/
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06-09-2002, 09:13 PM
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#4
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Moderator
Join Date: May 1999
Location: Tejas
Posts: 7,896
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by zo6vette:
my friend told me that having the slp loudmouth exhaust or straight pipe on the Ls1 will wear out the engine valves faster..Is that true? will this type of exhaust cause the valves to to wear out and weaken? any comments?</font>
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More or less the guy who told you that should be working as the guy who cleans port-a-johns after a nascar race..and not have any real connection with any kind of job in the automotive field..
lets hope this is true
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DaveD
The Phantom of CamaroZ28.com
1998 WS6 #207
1998 Regal GS
"Snoogens"
Http://PhantomTA.cz28.com
I am a proud supporter of.... "Boycott Lapeer Dragway"...
__________________
When I first came here, this was all swamp. Everyone said I was daft to build a castle on a swamp, but I built in all the same, just to show them. It sank into the swamp. So I built a second one. That sank into the swamp. So I built a third. That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle in all of England.
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06-10-2002, 09:36 AM
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#5
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Member
Join Date: May 2002
Location: royal oak, MI, USA
Posts: 264
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Maybe what he was thinking was running headers with no cats and a traight pipe. with no back pressure you could burn the valves, but with the cats on and just a straight pipe its just loud. I have a slp loud mouth and its the ****. I recommend it. only paid 325 from ls1motorsports.
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Scott Parkinson
2001 Sunset Orange Z-28
SLP Loud Mouth, K&N, Mass Air, 160 Thermistat, Power Programmer, All aftermarket suspension/braces, 8.5mm Plug Wires, 125 hp Shot. Runnin low 12's all day.
__________________
Scott Parkinson
2001 Sunset Orange Z-28
SLP Loud Mouth Cat-Back Exhaust, LS1 Motorsports Intake Bellow, K&N Filter, MTI Clear Air Lid, Mass Air, 160 Thermistat, Power Programmer, 8.5mm Plug Wires, BMR Sway Bars, BMR STB, Competition Engineering Frame Ties, Lakewood LCA's and Panhard Rod, 125 hp Shot. Runnin low 12's all day.
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06-10-2002, 08:41 PM
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#6
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Registered User
Join Date: Apr 2002
Location: Chi-town
Posts: 240
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by asianice25:
Maybe what he was thinking was running headers with no cats and a traight pipe. with no back pressure you could burn the valves, but with the cats on and just a straight pipe its just loud. I have a slp loud mouth and its the ****. I recommend it. only paid 325 from ls1motorsports.</font>
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That's probably what the person who told him was talking about, burning the exhaust valves if you don't have any back pressure.
Anyone know if race mufflers would give enough back pressure with true duals?
I want to try it on my Nova but my dad keeps convincing me not to so I don't burn my valves.
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1978 Nova 4dr, wanna-be SS 
-Fixing massive rust.
-Stock 305 for now.
Future hopes:
-Mild 350, Twin Turbos after college.
-TH700R4
Street Sleeper
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06-10-2002, 10:57 PM
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#7
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Prominent Member
Join Date: Jun 2000
Location: Elbert, CO
Posts: 2,730
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Even headers with straight pipe all the way back creates some back pressure, I'm pretty sure even with long tubes you are okay with straight pipe.
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-Evan Bangs
1998 Trans Am - 5.7L V8, A4, 3.23s, Lid, MAC Mid-length Headers and Off-road pipe, SLP Loudmouth, Tinted Windows, Yellow Painted Calipers, Chameleon Blue-Green paint.
Pics of my cars, friends, etc.
__________________
-Evan Bangs
1998 Trans Am - 5.7L V8, A4, 3.23s, Lid, MAC Mid-length Headers and Off-road pipe, SLP Loudmouth, Tinted Windows, Yellow Painted Calipers, Chameleon Blue-Green paint.
Pics of my cars, friends, etc.
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06-11-2002, 12:06 AM
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#8
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Member
Join Date: May 2001
Location: Fort Worth, Tx
Posts: 233
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If you run cats, there is your back-pressure.
and I don't believe that statement to begin with, look how many people have been running around for years with borlas wide open or cut-outs. That's the same thing.
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2001 Camaro SS A4 #4586
Mods: Holley Powershot Filter, WaterWetter, MSD 8.5mm Super Conductor Wires, NGK TR55's, Shaner S2 Polished TB, SLP LT Headers, SLP Loudmouth, SLP Airlid, SLP Bellows, SLP SFC's, 160-Tstat, !FRA, !TB, !MAF Screen
Coming Soon: Baer Eradispeed Cross-drilled & Sloted Rotors, Yank PY3600E, Spohn Adjustable Torque Arm
E-mail: eyedol_2000@yahoo.com
__________________
2001 Camaro SS A4 #4586
Mods: F1 Cam, Speedtek Stage 2 Heads 2.02/1.60, Yella Terra 1.7's, Speedtek Stage 2 4L60E, Yank PY3600E, Speedtek Airlid, Shaner S2 Polished TB, ASP Pulley, ALL Bolt-ons inbetween, SLP LT Headers, Cats/OR pipes, Lane's 4" Catback with Magnaflow, Spohn Chrome-moly SFC's, BMR Chrome-moly STB, Spohn Chrome-moly Adjustable Torque Arm, Denny's HD Aluminum DS, Baer Eradispeed's, Hawk Pads, Earls Stainless lines.
Tuned with LS1edit by Chris Robinson
E-mail: eyedol_2000@yahoo.com
My Website
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06-11-2002, 12:43 AM
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#9
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New Member
Join Date: Mar 2002
Location: North Little Rock, AR, Usa
Posts: 4
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Does The SLP Loud Mouth "pop" when you rev it up or get off the throtle quick?
__________________
99 Navy Blue Metalic Z28RS-
K&N
Flowmaster
Carbon Fiber MTI Air Lid
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06-11-2002, 12:09 PM
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#10
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Member
Join Date: May 2001
Location: Fort Worth, Tx
Posts: 233
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only time mine pops is when I'm decelerating from around 4 grand in 3rd on the highway, or around the same rpm in 2nd.
__________________
2001 Camaro SS A4 #4586
Mods: F1 Cam, Speedtek Stage 2 Heads 2.02/1.60, Yella Terra 1.7's, Speedtek Stage 2 4L60E, Yank PY3600E, Speedtek Airlid, Shaner S2 Polished TB, ASP Pulley, ALL Bolt-ons inbetween, SLP LT Headers, Cats/OR pipes, Lane's 4" Catback with Magnaflow, Spohn Chrome-moly SFC's, BMR Chrome-moly STB, Spohn Chrome-moly Adjustable Torque Arm, Denny's HD Aluminum DS, Baer Eradispeed's, Hawk Pads, Earls Stainless lines.
Tuned with LS1edit by Chris Robinson
E-mail: eyedol_2000@yahoo.com
My Website
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