Thanks Patrick G Nice Gain with Flowmaster Merger Y Pipe.
#1
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You will probably pick up at least 10 rwhp by running the proper y collector and keeping your cats. Just run the 4" pipe as far back as you can before reducing it to 3". While a 4" cutout is nice, the 3" loudmouth flows pretty well.
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2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE Mods list, Idle Sound Clip, WOT video, 183.092mph video
2007 Jeep Grand Cherokee SRT8 BWoody CAI, 214/218 114LSA cam, ported intake, ARH Headers: 12.12@112.70mph, 150.942mph Texas Mile.
2007 Suburban 5.3L K&N FIPK, EFI Live-tuned for max power and fuel economy.
LS1,LS2,LS3,LS7 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX drivability & dyno tuning by appointment only.
Well I recently bought the Flowmaster Merge collector and had an exhaust shop install it. I took photos of it. It is on my phone dont know how to put it on internet. Anyway what a diffrence. The TSP catted Y has been modified and both pipes from headers are merging perfect(Parrell to each other rather than perpindicular. I probably got 10-12 rwhp just for doin that. Like u said. I feel more torque from 2000-4000 rpms. Before I was at 390 rwhp, now I know I am about 400 rwhp. Cant wait to get the Tony Mamo ported AFR Heads and Ported Fast 92mm. Thanks Pat G.
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2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE Mods list, Idle Sound Clip, WOT video, 183.092mph video
2007 Jeep Grand Cherokee SRT8 BWoody CAI, 214/218 114LSA cam, ported intake, ARH Headers: 12.12@112.70mph, 150.942mph Texas Mile.
2007 Suburban 5.3L K&N FIPK, EFI Live-tuned for max power and fuel economy.
LS1,LS2,LS3,LS7 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX drivability & dyno tuning by appointment only.
Well I recently bought the Flowmaster Merge collector and had an exhaust shop install it. I took photos of it. It is on my phone dont know how to put it on internet. Anyway what a diffrence. The TSP catted Y has been modified and both pipes from headers are merging perfect(Parrell to each other rather than perpindicular. I probably got 10-12 rwhp just for doin that. Like u said. I feel more torque from 2000-4000 rpms. Before I was at 390 rwhp, now I know I am about 400 rwhp. Cant wait to get the Tony Mamo ported AFR Heads and Ported Fast 92mm. Thanks Pat G.
#2
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Good report. One 3" pipe slamming together into another single 3" pipe is not an ideal way to construct a y-pipe for making power (or sound). The Flowmaster merge collector into a 4" pipe is a good mod. Does the tone sound any different?
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
#7
LS1 Tech Administrator
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The idea is to go from this:
![](http://guerragroup.com/tspory.JPG)
To something more like this:
To something more like this:
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
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#8
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Patrick G- Where can I get that kind of merge? That ones look like it is stainless vs. the flowmaster which is not. I seen where LG developed that merge but I am unable to find it on there website. Any help?
#9
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It's an LG y-merge that Burns Stainless makes exclusively for LG. It's totally badass, but big megabucks. The flowmaster merge comes fairly close in power while costing around $50.
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![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
#17
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Thats kinda what I did, except I do not have a cutout yet, but will soon.
I had that same exact ORY in pic 1.... I hated how it sounded... mad rasp and a hammering noise from 2000-2500 RPM. So I bought a flowmaster merge, and had that installed. Now car sounds better, tho still a bit of rasp... The merge I got though was a 3" to 3.5"... not 4" like the OP did. Maybe rasp would be gone if I had went with the bigger merge. Nonetheless it was worth every penny and I would suggest to anyone to go with this merge.
On a side note, where do u get a stainless cutout like that but in 3.5"? Price?
I had that same exact ORY in pic 1.... I hated how it sounded... mad rasp and a hammering noise from 2000-2500 RPM. So I bought a flowmaster merge, and had that installed. Now car sounds better, tho still a bit of rasp... The merge I got though was a 3" to 3.5"... not 4" like the OP did. Maybe rasp would be gone if I had went with the bigger merge. Nonetheless it was worth every penny and I would suggest to anyone to go with this merge.
On a side note, where do u get a stainless cutout like that but in 3.5"? Price?
#18
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*offtopic* patrick-your ws6 is bad ***! Thing hauls major *** on that texas mile. If you have any more videos of it on the mile, pm me them please. Whats the displacement of your current engine?