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Exhaust Shoot-out Click Here
GT Thunder Test Bench 
This page will always be under construction. Please check back frequently for more
info. I have over 5000 dyno runs that I can put here as I have time. I will keep the most recent testing posted on here first. If you want more details on the tests feel free to contact me by e-mail and I will reply as I have time.
If you are building a product that you would like tested we will gladly test and post on here as time permits.
Remember an educated public will expect higher quality products and services.
These tests are designed to help you deside what is best for you and your aplication.
Every company out there has the intent to build a good product that everyone likes but you must remember that only you can deside whether you like the product.
Enjoy
Lazarus Sommers
Dyno Runs
By group or Individual
400EX Runs Click Here
Yamaha 350 Warrior Runs Click Here
This is a stock yz250f vs. a stock 2001 kx125.
CLICK HERE
This is what G T Thunder stage II porting on a Banshee can do with the right parts.
Bike owner: John Shephard.
CLICK HERECLICK HERE
440 Kit with Big Gun exhaust vs. GT Thunder exhaust.
CLICK HERE
All Stock 1999 RM80.
CLICK HERE
Polaris 500 with Hot Seat exhaust - 29.6 HP.
CLICK HERE
400ex all stock vs. with no spark arrester.
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400ex all stock vs. with no spark arrester.
1995 Yamaha YZ80.
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Yamaha yz80.
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TRX250R Pipe tests - DG Pipe vs Dyno Port pipe vs Cobra pipe.
CLICK HERE
TRX250R Pipe tests - Stock pipe vs Trinity pipe vs LRD pipe.
CLICK HERE
TRX250R Pipe tests - LDR pipe vs Old FMF Fatty.
CLICK HERE
TRX250R Pipe tests - 300cc Cyl.
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Stock 400EX with aftermarket exhaust and no air box lid compared to same with White Bros. cam.
To make the cammed engine run right we had to go to a 160 main jet but I left this run with a 155 main jet.
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Stock 350X with Cobra exhaust compared to Stock 400EX.
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All stock 1997 400 polaris.
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My latest 400EX setup compared to a 1999 YZ 400F.
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TRX250R Pipe comparison. Everything is the same on these dyno runs except the pipe. Compares Old FMF Fatty, New FMF Fatty and Paul turner race pipe. There is a greater differance than you may think. View the next dyno run to see what I mean.
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TRX250R Pipe comparison continued. This graph displays torque not horsepower.
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ATC250R with 300 big bore, custome pipe, PGI ignition and Lectron carb. 185# three wheeler
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All stock TRX250X compared to same with White Brothers exhaust.
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TRX250 with a CR500 engine installed. Cyl. is ported and has head rechambered. Custom pipe to fit quad & Lectron carb. I can post photo of this pipe if anyone wants to see it.
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1997 YZ250 that has beeb modified by FCR developement including Head work, ported, polish carb & ProCircuit pipe.
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250 R with stock 1986 cylinder, cool head - 23cc dome, rad valve FMF fatty pipe, FMF turbine core silencer, and a K&N filter. 41.1HP
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1998 Stock Banshee compared to same with stock bore and Toomey pipes, 34mm PJ carbs with 155 main jet, Stage III porting, Cool Head, and Ignition advanced 5 deg.
CLICK HERE
1996 Yahama 350 Wolverine all stock max HP - 13.8
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1996 Honda 300EX all stock compared to same with Ported head, Wiseco high comp. piston, mild cam, Cobra jet pipe. 6.8 HP increase!
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1999 KX80 with the following mods:Stroker CrankAltered port timingModified powervalve govener28mm carbFMF pire
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1998 RM250 all stock compared to one ported, rechambered head & Bills pipe.
CLICK HERE
All stock YZ400F hitting rev limiter at 11,600 RPM compared to a highley modiried TRX400EX hitting rev limiter at 9,200 RPM. It's a shame that you have to spend mega bucks on the Honda. If you want detailes on the TRX mods, feel free to contact me.
LS
CLICK HERE
O-ring chain compared to Non-O-ring chain
CLICK HERE
Stock Impluse Mini Quad (max horsepower 1.3) campared to Stock Lem Mini Quad (max horsepower 2.3)
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Stock 1999 RM 125 as received from Suzuki compared to one with the Billspipe installed.
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Stock 1998 RM 250 compared to one with the Billspipe installed.
CLICK HERE
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