Kook's vs Doug Thorley
06-25-2010, 09:29 PM
#1
Kook's vs Doug Thorley Today's improvements!
Kook's 1 7/8" long tubes vs Doug Thorley 1 3/4" Tri-Y's:
Kooks ports vs DT's, you can see on the DT's the soot ring showing how much smaller they were then the ports on my head (heads are ported)! Pretty sure that wasn't helping power any! The Kook's mate up perfectly!
Kook's 3" midpipe vs Stock with welded x-pipe:
So far so good! Car doesn't feel like its wheezing anymore!
Kook's 1 7/8" long tubes vs Doug Thorley 1 3/4" Tri-Y's:
Kooks ports vs DT's, you can see on the DT's the soot ring showing how much smaller they were then the ports on my head (heads are ported)! Pretty sure that wasn't helping power any! The Kook's mate up perfectly!
Kook's 3" midpipe vs Stock with welded x-pipe:
So far so good! Car doesn't feel like its wheezing anymore!
06-26-2010, 11:35 PM
#4
I have seen the DT headers up close and they look really restrictive compared to the Kooks and ARH 1 7/8" headers. Funny thing is, they made exactly as much power as the larger headers. Bottom line, don't be too disappointed if you don't ET a whole lot better or dyno better with the swap. The Doug Thorley headers might look small, but seem to perform pretty big.
__________________
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.
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.
06-26-2010, 11:47 PM
#5
Banned
I have seen the DT headers up close and they look really restrictive compared to the Kooks and ARH 1 7/8" headers. Funny thing is, they made exactly as much power as the larger headers. Bottom line, don't be too disappointed if you don't ET a whole lot better or dyno better with the swap. The Doug Thorley headers might look small, but seem to perform pretty big.
06-27-2010, 08:12 AM
#6
I have seen the DT headers up close and they look really restrictive compared to the Kooks and ARH 1 7/8" headers. Funny thing is, they made exactly as much power as the larger headers. Bottom line, don't be too disappointed if you don't ET a whole lot better or dyno better with the swap. The Doug Thorley headers might look small, but seem to perform pretty big.
I can see the DT's performing close to the others at the lower 400'ish power levels since your not moving that much air, but once you get closer to 650'ish hp or so I think the Kooks will perform a lot better then the smaller headers.
Even the rear section alone should gain some power... trying to push 500+hp through the stock 2.25" pipes isn't exactly optimal.
06-27-2010, 05:26 PM
#7
At what power level? With ported heads? N/A or F/I?
I can see the DT's performing close to the others at the lower 400'ish power levels since your not moving that much air, but once you get closer to 650'ish hp or so I think the Kooks will perform a lot better then the smaller headers.
Even the rear section alone should gain some power... trying to push 500+hp through the stock 2.25" pipes isn't exactly optimal.
I can see the DT's performing close to the others at the lower 400'ish power levels since your not moving that much air, but once you get closer to 650'ish hp or so I think the Kooks will perform a lot better then the smaller headers.
Even the rear section alone should gain some power... trying to push 500+hp through the stock 2.25" pipes isn't exactly optimal.
__________________
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.
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.
Trending Topics
06-27-2010, 07:23 PM
#8
It appears that the cammed cars in the 420-450hp range it starts to make more of a difference.
Then at the 500+ level the little things holding the car back become apparent. Especially when you start revving decent size cams up to the 7k'ish RPM range.
08-02-2010, 12:14 AM
#9
TECH Enthusiast
iTrader: (3)
Join Date: Feb 2005
Location: Kyle, TX
Posts: 525
Likes: 0
Received 0 Likes
on
0 Posts
Not exactly sure someone correct me if wrong but the reason it performs so well is the y's in DT's are there for a reason I think they there based on the concept of scavenging the exhaust gasses alittle better than your conventional header design.
08-02-2010, 10:00 AM
#10
The DT's do work well at the sub 400hp to mid 400hp level, but approaching 500+ the restrictions became apparent. My DT's are now on my buddy's car and he's happy with them.
I saw gains on the dyno switching to Kook's backed up by gains in ET both N/A and on spray.
